The No. 10 Konica Minolta Cadillac DPi continued to dominate during the fifth hour of the Rolex 24. Fernando Alonso led 42 minutes prior to his pit stop, which saw Kamui Kobayashi retain the lead — despite a slide while exiting the pits on cold tires.
At the end of the hour, Kobayashi led Tristan Nunez in the No. 77 Mazda by 13.474 seconds, followed by the Nos. 6 and 7 Team Penske Acuras driven by Simon Pagenaud and Alexander Rossi in his Rolex 24 debut. Eight of the 11 DPis were on the lead lap.
Sebastian Saavedra drove the DragonSpeed No. 18 ORECA to the top of LMP2, while the No. 62 Risi Competizione Ferrari driven by Davide Rigon held the lead in GTLM and the No. 33 Team Riley Motorsports Mercedes-AMG of Felipe Fraga led GTD.
The biggest moment came when Harry Tincknell spun the second-place No. 55 Mazda DPi in the International Horseshoe after light contact with the No. 57 Heinricher Acura NSX GT3 of Katherine Legge; the incident was reviewed but no action was taken. Both cars continued and the race continued under green, although Tincknell dropped to eighth and the Mazda lost a lap on its ensuing pit stop, when Jonathan Bomarito took over driving duties.