Action Express Racing survived brief scares on both its Cadillac DPi cars at the front of the pack to hold a comfortable lead with four hours remaining in the Rolex 24 at Daytona, with the #5 Mustang Sampling Racing sitting three laps clear of the field.

Following problems for both Acura-Penske entries just before dawn at Daytona, the pair of Action Express-led cars were left on the lead lap, only for both to suffer from overheating issues.

The #5 Cadillac was able to pit under a Full Course Yellow called for debris to undergo a change of its rear structure, allowing the sister #31 Whelen Engineering Racing car to move back onto the lead lap and sit just behind as the morning wore on.

However, the same issue struck the #31 Cadillac, forcing Mike Conway to go behind the wall and drop three laps back from the lead car, giving United Autosports a chance to move into the top two positions.

The #32 United Autosports Ligier JS P217 had bigger issues, though, with an ongoing clutch problem forcing the team to also complete repairs on its ca, allowing Core Autosport to move into third place in the process. The #32 car now sits fourth overall, six laps back from the leader.

Fernando Alonso, Lando Norris and Phil Hanson's troublesome race in the sister #23 United Autosports car continued as they were forced to go behind the wall for a second time in the morning, causing them to drop down the order again. The trio sit 19th at the moment, 35 laps off the lead and two laps back from the #37 Jackie Chan DCR Jota car featuring Lance Stroll.

Ford continues to dominate proceedings in GT Le Mans, albeit with Corvette moving into striking distance through the morning as the #3 car shared by Jan Magnussen, Antonio Garcia and Mike Rockenfeller moved onto the lead lap in class.

GT Daytona continues to be the closest-fought class heading into the final four horus of the race, with Franck Perera leading in the #11 Grasser Racing Team Lamborghini Huracan GT3 by 12 seconds from Riley Motorsport's Luca Stolz.