Joao Barbosa put the No. 5 Mustang Sampling Cadillac DPi-V.R into the lead at the five-hour mark following a pit stop by Action Express Racing teammate Eric Curran at 4h47m in the No. 31 Whelen Engineering entry.
Jonathon Bomarito is now at the wheel of the third-place No. 55 Team Joest Mazda, followed by the lapped No. 10 Konica Minolta Cadillac of Renger van der Zande.
Teammates also continued to dominate in GT Le Mans, with Ford Chip Ganassi Racing’s Ryan Briscoe (No. 67) leading Joey Hand (No. 66) in a pair of Ford GTs. John Edwards is third in the No. 24 Team RLL BMW M8 GTLM.
However, not all teamwork was positive during the hour. The two AIM Vasser Sullivan Lexus RC F GT3s made contact while battling for 10th in GTD. Frankie Montecalvo had rear-end damage in the No. 12 after contact with the No. 14 of Philipp Frommenwiler, who spun and hit a barrier, sustaining left-front damage.
The Swiss driver made two laps after a brief stop, before going to the paddock for repairs.
The No. 33 Wynn’s Mercedes-AMG continued to lead GTD, Ben Keating at the wheel, with nine cars on the lead lap.
Four hours marked the end of the first Michelin Endurance Cup segment. The No. 33 Wynn’s Mercedes-AMG entered holding the GTD class lead with 14 points, which they padded with five bonus points. In DPi, the class-leading No. 10 Konica Minolta Cadillac scored two points for a total of 20, while the second-place No. 31 Whelen’s Engineering Cadillac scored five bonus points for leading the race, and now have 18 points.
Action Express Racing has won the four-race competition for five consecutive years.