Kyle Busch tops opening practice, No. 88 team replaces engine

MORE: Full practice results | Best 10-lap times | Full Miami schedule Kyle Busch topped the leaderboard in Friday's first Monster Energy NASCAR Cup Series practice at Homestead-Miami Speedway at 172.695 mph in the No. 18 Joe Gibbs Racing Toyota. Right behind him was fellow NASCAR Playoffs Championship 4 competitor Martin Truex Jr. in the No. 78 Furniture Row Racing Toyota at 172.529 mph. Rounding out the top five were playoffs driver Kevin Harvick in the No. 4 Stewart-Haas Racing Ford at 171.865 mph, Kyle Larson in the No. 42 Chip Ganassi Racing Chevrolet at 171.217 mph and Denny Hamlin in the No. 11 JGR Toyota at 170.854 mph. Brad Keselowski, the fourth competitor in the Championship 4, was 21st on the leaderboard at 168.919 mph. The team was working on a brake issue on his No. 2 Team Penske Ford that limited his practice time to just five laps. PHOTOS: Best from Miami Dale Earnhardt Jr., ahead of his final planned Monster Energy Series start, had engine issues in his No. 88 Hendrick Motorsports Chevrolet. His session was cut early, and he was 14th on the speed charts after running just 12 laps as the team worked to replace the engine. Earnhardt addressed the issue in a video he posted on Twitter.