Six races into the NASCAR season, William Byron holds an early edge in the Cup Series standings. The Hendrick Motorsports driver has been in that No. 1 perch the last four weeks … and has another Daytona 500 trophy already in his season’s souvenir case.

Multiple factors have put the No. 24 Chevrolet team and its 27-year-old star in such a prime early position, but it’s difficult to overlook just how stellar Byron has been so far in several crucial performance metrics.

RELATED: Cup Series standings | NASCAR Insights analysis explained

Byron ranks first in three of four key performance categories this season, according to NASCAR Insights data. The Racing Insights-powered analysis shows Byron leading the Cup Series in speed rating, defense rating and restart performance; the only category he isn’t heading is passer rating, where he’s a respectable eighth in the field.

Those top-rated metrics in the speed rating category stem from his overall pace relative to the rest of the field, with NASCAR Insights calculating short- and long-run speed and his efforts in both clean and dirty air. Byron’s defense rating measures his ability to hold position when under pressure, and his restart rating weighs his positions gained or lost and consistency after the green flag flies. The only other driver with top-10 ratings in all four categories is Tyler Reddick — third in both speed and passer rating, sixth in defense rating and 10th on restarts.

The Daytona win is one of four top-six finishes this year for Byron, who carries a healthy 36-point lead over Hendrick teammate Kyle Larson in the standings into Sunday’s Cook Out 400 (3 p.m. ET, FS1, MRN Radio, SiriusXM NASCAR Radio) at Martinsville Speedway. Two of his 14 career Cup Series wins have come at the Virginia short track, and he is the 400-lap race’s defending winner. He is also the only driver to lead at least one lap in all six Cup Series events this season.

MORE: Power Rankings

Byron’s only blips on his results this year include a 27th-place run last month at Atlanta Motor Speedway, where late-race contact at the front foiled his bid for back-to-back wins. He was also in contention for a solid finish last weekend at Homestead-Miami Speedway, when a pit-road speeding penalty late in the race knocked Byron from the top 10; he still wound up 12th.

Byron ended up third in last year’s championship race, behind Team Penske’s Joey Logano and Ryan Blaney in the Phoenix Raceway finale. But momentum was squarely on his side during the season’s home stretch; he was among the top six finishers in each of the final seven races of 2024.

NASCAR Insights top 20 chart after Homestead
Credit: Racing Insights

When Ryan Ellis informed Alpha Prime Racing he wasn’t returning to the team for the 2025 NASCAR Xfinity Series season, owner Tommy Joe Martins needed to find his next franchise driver to be paired with Brennan Poole. Coincidentally, 21-year-old Parker Retzlaff became available.

Retzlaff, fresh off his first two full-time seasons in the series with Jordan Anderson Racing, placed 16th and 21st in the championship standings in 2023 and 2024, respectively. And while Retzlaff led the series with 12 DNFs in 2024, Martins saw plenty of upside in the Wisconsin native.

RELATED: Parker Retzlaff driver page | Martinsville schedule

“Parker is exactly the type of guy that we want,” Martins told NASCAR.com. “He is a talented young race car driver that has proven he’s not afraid to race on a smaller team and try to overachieve.”

Retzlaff had other options to compete for different teams in 2025, but his main priority was to remain full-time in the Xfinity Series. For the fourth season in a row, though, he will work with new people. While Retzlaff wheeled the No. 31 Chevrolet for two seasons, there were changes aplenty. He worked with different crew chiefs both years and wanted a fresh start for 2025.

“Some stuff didn’t match, some stuff wasn’t working,” Retzlaff said of his two-year stint with Jordan Anderson Racing. “I needed a change in my life to be happier from a sponsor’s side and from my side.

“Nothing was staying the same in my life. I was there for two years, and I didn’t have the same people for two years in a row. They switched every single person both years. I think I had a lot of pieces that could have worked well, but not with so much change in my life.”

When Retzlaff entered his rookie campaign, he was a soft-spoken driver, receiving guidance from those around him, whether it be his peers or team leaders. Throughout his sophomore campaign last year, he felt he had found his voice and was open to expressing himself more freely.

Ultimately, it led to the biggest change of his career to date, switching teams as a full-time driver.

“I was really quiet when I first started and never said anything,” Retzlaff said. “Now, I feel like I need to say something if something needs a change, and I think that was some of the problem. I didn’t feel like I had as much say as I needed to have for it to go better for me and for the sponsor’s side. I’m happy to make a little bit of change.

“I think it’s been a good change. I’ve been very happy throughout the offseason doing it. I think we have a good team for this year.”

What also sold Retzlaff on Alpha Prime was that Poole finished better than both Jordan Anderson Racing cars in the championship standings last season without having a leased engine program with ECR. The rebranded No. 4 team has a full motor deal this season with ECR, giving Alpha Prime its best chance of running toward the front of the field to date.

“That’s a big deal to compare ourselves apples to apples against some of those other guys midpack now that are doing engine deals,” Martins said. “The last few years, we haven’t been able to do that with our budget. It has been fun for us to see that our cars are a process and our ability to compete at some of those types of race tracks where the motor does play a big part of it.”

Through the opening six races, Retzlaff has experienced tough racing luck. He was involved in a wreck while running inside the top 15 in the season opener at Daytona International Speedway. Even more heartbreaking was when the No. 4 car made a move on Austin Hill during the final lap at Atlanta Motor Speedway while battling for the win, only to have a cut tire.

Rock bottom was a handful of mechanical woes at Circuit of The Americas during practice and qualifying, preventing Retzlaff from making the field. Martins considered practice and qualifying at COTA the worst day in company history, with two Alpha Prime cars missing the race.

Retzlaff was on the upswing at Phoenix Raceway, finishing a season-best 11th. He placed 17th at Homestead-Miami Speedway and has gained 11 spots in the championship standings over the last three races, currently sitting in 26th ahead of Saturday at Martinsville Speedway (5 p.m. ET, The CW, MRN Radio, SiriusXM NASCAR Radio). Retzlaff is the most recent pole winner at the Virginia short track.

MORE: Xfinity Series standings | Xfinity Series schedule

Even with the setbacks to begin 2025, Retzlaff’s goal is to be a linchpin in the top 15 and eventually battle for top 10s weekly. The bonus? Winning a race and making the playoffs.

“If the goal is to make the playoffs, the only way that we’re going to do that is to win a race,” Martins said. “To point your way into the playoffs takes a level of speed and running in the top 10, consistently scoring stage points. That’s just not where our team is at. I think when we are firing on all cylinders, we’re probably racing around the top 15. In Parker’s case, he’s shown he can race around the top 10, but that’s still not scoring major stage points every week.

“I’ve tried to give him confidence and how much we believe in him. That’s a big thing for me with young drivers. They are probably not going to be perfect, but ultimately, you’re going to have their back, and that’s what we want to do with Parker.”

NASCAR officials issued fines to four teams in the Xfinity Series on Tuesday for lug-nut infractions last weekend at Homestead-Miami Speedway.

In a post-race inspection, competition officials found one unsecured lug nut each on the No. 10 Kaulig Racing Chevrolet driven by Daniel Dye, the No. 18 Joe Gibbs Racing Toyota piloted by William Sawalich, the No. 21 Richard Childress Racing Chevrolet wheeled by Austin Hill and Anthony Alfredo’s No. 42 Young’s Motorsports Chevrolet. Hill was the highest finisher among the quartet, netting a third-place result. Following Hill was Dye (9th), Alfredo (18th) and Sawalich (24th).

RELATED: Xfinity Series standings | Martinsville schedule 

The violation of Sections 8.8.10.4a in the NASCAR Rule Book drew a $5,000 fine for each team.

The Xfinity Series next races at Martinsville Speedway on Saturday (5 p.m. ET, The CW, MRN Radio, SiriusXM NASCAR Radio).

Introducing NASCAR Insights.

Each week after every Cup Series race, NASCAR.com — with assistance from our partners at Racing Insights — will bring you metrics that matter, going beyond the official race results with analytics and stats. The extra information and data help to provide context to each weekend’s action, showing who is overachieving and maximizing their results and who may have areas for improvement in certain categories.

RELATED: Cup Series standings

NASCAR Insights data will be used to provide another layer of depth to NASCAR.com’s coverage, which includes projected results for each week’s race from Racing Insights, in addition to facts and figures — analyzing multiple data points throughout each lap — that can be used to zero in on performance trends and analysis for every driver in the field.

The four main NASCAR Insights metrics, including their subcategories:

Passer Rating

Passer Rating measures a driver’s efficiency in overtaking, tracking every passing opportunity throughout the race (excludes restart laps). Additionally, this statistic includes:

• Completion Efficiency: How quickly a driver is able to complete an overtake once within passing range.
• Time in Range: Amount of time a driver is in an overtaking zone without being able to complete a pass.
• Position: Running position of passes.
• Total Passes: Overall count of successful true passes during the race.
• Lapped Traffic: How well the driver manages passing lapped cars.

Defense Rating

Evaluates a driver’s ability to hold their position when under pressure, assessing their effectiveness in fending off faster cars (excludes restart laps).

• Defensive Effectiveness: How successful a driver is at preventing opponents from overtaking when they are within range to pass.
• Pressure Duration: How long the driver spends being under threat of being passed.
• Position: Running position where defending is taking place.
• Passing Time: Time it takes for the pursuing car to complete the pass, if they eventually do.
• Relative Speed: Speed of a driver’s car relative to the field when holding onto position.

Speed Rating

Analyzes a driver’s overall pace relative to the field, tracking lap times throughout the race.

• Long-Run Speed: Evaluates tire management by tracking lap time degradation compared to other drivers on similar tire strategies.
• Short-Run Speed: Identifies drivers who maximize fresh tires, measuring their ability to post fast laps immediately after a pit stop.
• Clean Air Speed: Assesses a driver’s pace when running in clean air, unaffected by the aerodynamic turbulence of a car ahead.
• Dirty Air Speed: Evaluates a driver’s ability to maintain speed in traffic, considering the impact of turbulent air on handling.

Restart Rating

Assesses a driver’s performance in gaining or maintaining position after a start or restart.

• Position Change: Number of positions a driver gains or loses immediately after the restart.
• Consistency: Ability to hold running position during the restart.
• Position: Running position where the driver is gaining, losing, or holding position.

The following chart provides a glimpse at the top 10 finishers from Sunday’s race at Homestead-Miami Speedway, showing where each of those drivers ranked among the 37-car field in the respective four categories.

NASCAR.com plans to incorporate these NASCAR Insights data and analysis into its coverage leading up to and following Sunday’s Cook Out 400 (3 p.m. ET, FS1, MRN and SiriusXM NASCAR Radio) at Martinsville Speedway and for every race remaining on the Cup Series calendar.

A view of the top 10 finishers from Homestead-Miami Speedway and their rankings relative to the rest of the Cup Series field
Racing Insights

After a month off, the 40th anniversary season of the NASCAR Whelen Modified Tour roars back to life Wednesday, April 16 at Connecticut’s Thompson Speedway Motorsports Park with the running of the Icebreaker 150 (live on FloRacing at 8 p.m.).

The race, originally scheduled for Sunday, March 30, was postponed twice due to the threat of inclement weather.

The race marks the 156th time since the creation of the Modified Tour in 1985 the series has visited the historic oval. In fact, the first Modified Tour race was held at Thompson on March 31, 1985 and won by NASCAR Hall of Famer Richie Evans.

No driver has won more Modified Tour races at Thompson than Mike Stefanik, who won 15 at the venue during his career. Reigning series champion Justin Bonsignore is a close second with 14 wins, with his most recent coming last fall. Other notable winners at Thompson include Ted Christopher, Jeff and Rick Fuller, Tony Hirschman, Ron Silk, Doug Coby, Steve Park and Reggie Ruggiero, among others.

Tickets to the Icebreaker 150 are available trackside. Below is everything you need to know about the second race of the 2025 NASCAR Whelen Modified Tour season.

Thompson Speedway Motorsports Park
Thompson Speedway Motorsports Park has hosted the NASCAR Whelen Modified Tour more than any other track in series history. (Photo: Nick Grace/NASCAR)

Icebreaker 150 at Thompson Speedway Motorsports Park

20141217085344 Thompson Speedway LogoThompson Speedway Motorsports Park has served as the backbone of the NASCAR Whelen Modified Tour schedule since the creation of the series in 1985.

That’s why Thompson is the perfect place to host the inaugural FloRacing Connecticut Challenge, a three-race miniseries open exclusively to team owners that have not participated on the Modified Tour in the last three years or are new to the series.

The miniseries features a championship purse totaling $23,750, including $7,500 to the eligible team that scores the most points during the three Thompson races this season. In addition, should an eligible team win one of the three Thompson races, they’ll earn an additional $1,250 bonus.

Drivers competing for eligible teams include Jake Johnson, Teddy Hodgdon, Matt Swanson, Eric Berndt, Max Zachem, Brian Sones and Dylan Slepian.

Those drivers will have their hands full against a field full of series regulars, all of whom will be looking to collect the checkered flag for themselves. Chief among them is Justin Bonsignore, who at 14 Thompson victories is one triumph away from tying Mike Stefanik at the top of the all-time Thompson Modified Tour wins list.

Patrick Emerling enters the race at Thompson as both the Modified Tour points leader and the winner of the most recent series event last month at Florida’s New Smyrna Speedway. He scored his first Thompson win last summer and will by trying to add a second victory Sunday.

Ron Silk, a seven-time Thompson winner, should also be among the contenders.

Matt Hirschman will be looking to join his father, eight-time Thompson winner Tony Hirschman, as a winner in Modified Tour competition at the 0.625-mile oval. Luke Baldwin will again pilot the No. 7 for his father Tommy Baldwin Jr.; Woody Pitkat will be at the helm of the No. 82 for team owner Danny Watts Jr.; and Austin Beers will chase his first Thompson win in the No. 64 KLM Motorsports entry.

Other notable entrants include Tyler Rypkema, Kyle Bonsignore, Andrew Krause, Chase Dowling, Craig Lutz, Tommy and Trevor Catalano and Eric Goodale, among others.

The full entry list for the Icebreaker 150 is available here.

Thompson Speedway Motorsports Park
Action during the 2024 IceBreaker 150 for the NASCAR Whelen Modified Tour at Thompson Speedway Motorsports Park on April 7, 2024. (Photo: Nick Grace/NASCAR)

RACING REFERENCE

RACE FACTS

Race Icebreaker 150
Date Wednesday, April 16, 2025
Track Thompson Speedway Motorsports Park
Layout 0.625-mile asphalt oval
Location Thompson, Connecticut
Start time 8 p.m. ET
Laps 150
Posted Awards $116,053
Tickets Trackside
How To Watch FloRacing

SCHEDULE: Wednesday, April 16 … Practice from 4:15 – 4:40 p.m. ET … Final practice from 4:45 to 5:15 p.m. ET … Qualifying at 7 p.m. ET … Start of the Icebreaker 150 (150 Laps / 93.75 Miles)

QUALIFYING: Two consecutive qualifying laps. Faster lap determines qualifying position. Adjustments or repairs may not be made on the vehicle after the vehicle has taken the green flag at the start/finish line. NASCAR reserves the right to have more than one vehicle engage in qualifying runs at the same time. Starting field for the 51st Annual Icebreaker 150 is limited to 30 starters including Provisional Positions.

TIRE ALLOTMENT: The maximum tire allotment available for this event is nine (9) tires per team. All tires used for qualifying and the race must be purchased at the track and scanned by Hoosier, unless otherwise approved in advance by the Series Director. Four (4) tires must be used for qualifying and to begin the race. All qualifying tires must remain in impound until released by NASCAR Officials. The remaining tire allotment may be used for practice and/or change tires during the event. The tire change rule is two (2) tires per per stop.

Have you ever wondered what really happens during a NASCAR pit stop or why cars seemingly go faster when lined up directly behind one another on the race track at high speeds?

Introducing the NASCAR AR Masterclass, a new immersive way for fans to go in-depth into the world of NASCAR, now available as part of the official NASCAR Mobile app on iOS and Android.

This new augmented reality feature aims to give fans foundational lessons on the sport of stock car racing, giving them the essential knowledge to advance to the next level in their fan journey.

Graphic of a digital pitstop
NASCAR

From learning all the intricacies that go into a pit stop to a visual explainer on the inner workings of a spotter’s role, fans will get the knowledge straight from the pros. Interactive lessons teach you the strategy and science behind drafting and how teams choose racing lines on a superspeedway. Developed with input from actual crew members and NASCAR insiders, these lessons form the foundation for a deeper understanding of one of the world’s premier motorsports series.

All the lessons are presented in augmented reality, letting fans see the action from every angle on devices they already own. Place the lessons on your tabletop, in your living room or anywhere you want to get an interactive explainer on the core elements of NASCAR action.

Best of all, AR Masterclass is free and available today in the official NASCAR Mobile app on iOS and Android. Whether you’re a new fan or a lifelong follower, NASCAR AR Masterclass puts the heart of the sport in the palm of your hand.

The NASCAR Cup Series next travels to Virginia for the Cook Out 400 at Martinsville Speedway on Sunday (3 p.m. ET, FS1, MRN Radio, SiriusXM NASCAR Radio). Short-track ace Burt Myers — who competed at Bowman Gray Stadium during the 2025 Cook Out Clash festivities — is one of 38 drivers slated to participate.

Casey Mears, who last appeared in a Cup race in 2019, returns in the No. 66 Garage 66 Ford. Mears, a multidiscipline racer with Rolex 24 and Baja 1000 trophies, has one Cup victory and three poles in 489 starts.

MARTINSVILLE ENTRY LISTS: Cup Series | Xfinity Series | Craftsman Truck Series

See the full entry list for the 400-lap event at the short track:

The NASCAR Craftsman Truck Series is rolling into Martinsville Speedway this weekend for the Boys and Girls Club of the Blue Ridge 200 (7:30 p.m. ET, FS1, NASCAR Racing Network, SiriusXM NASCAR Radio).

MARTINSVILLE ENTRY LISTS: Cup Series | Xfinity Series | Craftsman Truck Series

Here is a look at the drivers entered for Friday night in Martinsville:

During his stoic quest to be regarded as the greatest driver of his generation (if not all time), Kyle Larson rarely betrays many emotions.

So when the superstar who excels in multiple racing series celebrates one of his countless victories with uncommonly expressive feeling, it’s worth digging into the backstory — and it’s expansive at Homestead-Miami Speedway.

“One of the coolest wins in my Cup career,” Larson said immediately after winning Sunday. “Just because of the heartbreak I’ve had here.”

Hold on, heartbreak at Homestead? The track where Larson enjoys a built-in advantage for his uncanny ability to run inches from the wall at nearly 200 mph for 400 miles at a time?

RELATED: How Larson excels at riding wall at Homestead 

Larson holds Cup records for laps led (645) and stage wins (six) at Homestead. The expectation is that he can win every time there, but the reality is he often doesn’t — and his record includes some embarrassing errors by a driver who can position his car in tight spots most of the field can’t.

“Just watching him at his craft at this track, it’s like watching him at Knoxville or Eldora,” Hendrick Motorsports vice chairman Jeff Gordon said, referencing two dirt tracks where running the wall also is critical. “It’s fun, but it doesn’t guarantee wins. You don’t know when the cautions are going to come out. As good as his car and he is here, if he has any weakness, it’s short runs. … His car just doesn’t take off as good. Some of that’s setup (and) what it takes to be good ripping the wall on the long runs.”

It’s not as if the 1.5-mile track 30 miles south of Miami has been the white whale of Larson’s Cup career. Yet there have been some Ahab-esque elements that have tormented him — especially when untimely yellows neutralized the No. 5 Chevrolet, which ranked 24th in restart speed during Sunday’s win.

In some ways for Larson, Homestead has been the NASCAR version of his beloved Chili Bowl, the annual indoor dirt extravaganza whose prestige Larson once compared with the Daytona 500. It took him 13 years to earn his first “Golden Driller” in Tulsa, Oklahoma, even though he often dominated the world’s biggest Midget race.

He needed nine tries — and some big misses — to get his first win at Homestead-Miami Speedway. In 2016, Larson admittedly fell asleep on the final restart and allowed Jimmie Johnson to snatch the victory that punctuated his seventh championship. In 2017, he restrained himself and stayed put in third place to let Martin Truex Jr. and Kyle Busch battle for the win and season championship.

RELATED: Where Larson ranks in wins at Hendrick

And even since a breakthrough win at Homestead in 2022, the track still has haunted Larson with uncharacteristically sloppy mistakes.

In 2023, Larson bumbled while trying to seize the lead from Ryan Blaney on pit entry, smashing into the sand barrels in overt humiliation after leading 96 laps. Last year, he finished 13th after spinning with 13 laps remaining while anxiously trying to shoot a gap past Blaney and into the lead (and a berth in the Championship 4).

But none of that mattered to Alex Bowman when Larson’s No. 5 suddenly appeared in his rearview mirror, and the “Jaws” theme music began portentously echoing in his head.

“Pressure from the baddest dude on earth and I made a mistake and gave it to him,” Bowman posted on social media about hitting the wall with seven laps remaining shortly before yielding the lead.

This is another reason that Larson could revel in the win: It’s an “Intimidator”-style moment.

How many of Dale Earnhardt’s 76 career victories were a byproduct of the black No. 3 Chevrolet lurking in second place?

Larson’s victory Sunday was similarly earned through mere presence and reputation. Bowman surely wasn’t overwhelmed by his Hendrick Motorsports teammate’s performance.

Larson didn’t lead the most laps or win a stage. He scraped the wall a couple of dozen times, and his car’s speed further was hurt by a sizable hold in his left-side rocker panel from a pit collision. Crew chief Cliff Daniels’ most crucial call was choosing to skip a pit stop for repairs that ultimately would have eliminated the No. 5 from contention.

“It was a workman-like day,” Daniels said.

And Larson had to work hard to become the 30th driver with 30 Cup victories.

RELATED: Larson winner gear

There surely will be much flashier victories ahead for the 32-year-old. In two months, he could become the first to win the Indy 500 and Coca-Cola 600 on the same day — a legendary feat that would catapult Larson into the Andretti-Foyt pantheon.

There’ll be time for greatness later. His second Cup win at Homestead win was more about grit — and erasing the disappointment of nearly becoming the second driver in history to sweep a NASCAR tripleheader weekend.

After a late caution and overtime restart nullified a potential Xfinity win Saturday, Larson was set on kill to start the Cup race (“I just wanted to take the green flag and kick everybody’s ass today”) but then settled into grinding it out.

“I’m proud of myself for kind of overcoming that immature mindset before the race and just digging down deep to stay in it because it wasn’t a typical Homestead for me,” he said. “I was never able to get the lead until it really mattered, where typically I lead all the laps that don’t matter except for the last one.”

The outcome indeed was unusual.

No wonder that his reaction was, too.

Nate Ryan has written about NASCAR since 1996 while working at the San Bernardino Sun, Richmond Times-Dispatch, USA TODAY and for the past 10 years at NBC Sports Digital. He is a contributor to the new “Hauler Talk” show on the NASCAR Podcast Network. He also has covered various other motorsports, including the IndyCar and IMSA series.