Harrison Burton tops final Truck Series practice at Iowa

Harrison Burton surged atop the NASCAR Camping World Truck Series leaderboard in Saturday morning's final practice at Iowa Speedway. The 17-year-old Burton, prepping for his 10th career Truck Series start, posted a fast lap of 134.202 mph in the Kyle Busch Motorsports No. 51 Toyota, taking over the speed charts with just over a minute left in the 50-minute session. His lap edged out second-fastest Dalton Sargeant, a 20-year-old rookie who drove the GMS Racing No. 25 Chevrolet to a best lap of 133.849 mph. RELATED: Final practice results Series points leader Johnny Sauter (133.378 mph in another GMS entry) was third-fastest in the final tune-up for Saturday's M&M's 200 (7 p.m. ET, FS1, MRN, SiriusXM) on the .875-mile track. Stewart Friesen (133.074) and rookie Todd Gilliland (132.917) completed the top five. GMS Racing's Justin Haley, who led opening Truck Series practice, was sixth-quickest at 132.794 mph. Rookie Justin Fontaine was involved in the only incident in the session, crunching the Turn 3 wall with 16 minutes left on the clock. He drove his No. 45 Chevrolet back to the garage with significant right-rear damage. The Copp Motorsports No. 83 Chevrolet for driver Bayley Currey served a 15-minute penalty at the end of practice because the team was late to inspection in the series' most recent race at Texas Motor Speedway. Qualifying for the 200-lap race is scheduled Saturday at 4:30 p.m. ET (FS2). Haley makes early show of speed in Iowa Justin Haley topped the leaderboard in Saturday's first Camping World Truck Series practice at Iowa Speedway at 134.294 mph in the No. 24 GMS Racing Chevrolet. MORE: Full practice results Right behind him was Cody Coughlin in the No. 2 GMS Racing Chevrolet at 134.248 mph. Rounding out the top five were Brett Moffitt in the No. 16 Toyota, Dalton Sargeant in the No. 25 Chevrolet and Todd Gilliland in the No. 4 Toyota. Series points leader Johnny Sauter, who has won four of the series' eight races this season, was ninth fastest with a speed of 132.292 mph in the No. 21 GMS Racing Chevrolet. MORE: Full Iowa schedule