The caution flag waved for only the fourth time at the 9h45m mark, when the No. 8 Starworks Motorsport Vertical Bridge Audi R8 LMS GT3 of Parker Chase spun off and could not continue with drivetrain issues. The 10th hour ended under caution.
Pipo Derani (No. 31 Cadillac) had a 48-second lead over teammate Brendon Hartley (No. 5 Cadillac) when the yellow came out, with Renger van der Zande (No. 10 Cadillac) another 10 seconds back, the only other car on the lead lap.
The Action Express cars took on fuel only during their ensuing pit stops, Derani retaining the lead, while Jordan Taylor took over in the No. 10 without losing the team’s third place.
The caution allowed two DPi-class teams — both Romain Dumas (No. 54 CORE autosport Nissan) and Ricky Taylor (No. 7 Team Penske Acura) — to get back on the lead lap.
Moments before the caution, Stephen Simpson (No. 84 Cadillac) had spun off in Turn 6 battling Taylor’s Acura for fourth. Simpson was able to refire the JDC-Miller Motorsports machine and continue.
The caution erased Richard Westbrook’s (No. 67 Ford) 37sec lead in GTLM, with Antonio Garcia second in the No. 3 Corvette and Sebastien Bourdais third in the No. 66 Ford.
Ryan Briscoe took over the No. 67 under caution, and he was followed out of the pits by Joey Hand now in the No. 66 and Mike Rockenfeller in the No. 3 following driver changes.
Spencer Pumpelly led GTD by 42 seconds in the No. 44 Magnus Lamborghini, but under caution, Katherine Legge went to the lead in the No. 57 Heinricher Racing with Meyer-Shank Acura, followed by Jeff Westphal in the No. 63 Scuderia Corsa Ferrari and Trent Hindman in the No. 86 Meyer-Shank Racing with Curb-Agajanian Acura.