A total of 21 cars took part in the event split across two classes. 8 cars were entered in GTLM, and 13 in GTD. In GTD, Scott Hargrove returned to Pfaff Motorsports after Dennis Olsen and Matt Campbell filled in the previous two rounds. Due to a scheduling conflict for Christina Nielsen, who was at Suzuka International Racing Course for the Suzuka 10 Hours, was replaced by Alice Powell. Starworks Motorsport withdrew from the event following continued performance issues with its Audi R8 after competing at Road America. No changes happened in GTLM.
There were three practice sessions preceding the start of the race on Saturday, two on Friday and one on Saturday. The first session on Friday morning lasted one hour while the second session on Friday afternoon lasted one hour. The third on Saturday morning lasted one hour.
Saturday's early afternoon qualifying session was divided into two groups that lasted 15 minutes each. Cars in GTD were sent out first and, after a ten-minute interval, GTLM vehicles drove onto the track. All cars were required to be driven by one participant and the starting order was determined by the competitor's fastest lap. IMSA then arranged the grid so that the GTLM field started in front of all GTD cars. The session took place on a damp track but dried out as it progressed.
The final session of qualifying was for cars in the GTLM class. Laurens Vanthoor in the No. 912 Porsche clinched his second pole position of the season. The No. 3 Corvette of Magnussen 0.078 seconds off the pace in second. The two Fords were third and fourth (the No. 67 car driven by Briscoe in front of the No. 66 vehicle of Hand). Oliver Gavin's No. 4 Corvette completed the top five category qualifiers. Tandy was sixth after spinning at turn twelve, and made contact with the barrier leaving damage on the left side. The two BMW Team RLL cars rounded out the GTLM field.
The final results of GTLM kept Bamber and Vanthoor atop the Drivers' Championship with 280 points, but their advantage had been reduced by three as the victory of Pilet and Tandy meant the two drivers were eleven points behind. García and Magnussen's strong result allowed the duo to move into third while Briscoe and Westbrook fell to fourth as a result of finishing in fifth place. The final results of GTD meant Farnbacher and Hindman extended their advantage to 37 points as Robichon took over second position. Montecalvo and Bell advanced from fifth to fourth while Auberlen and Foley dropped from second to third. Porsche and Acura continued to top their respective Manufacturers' Championships, while Porsche GT Team and Meyer Shank Racing kept their respective advantages in their Teams' Championships with two rounds left in the season.
Class winners are denoted in bold and ‡.
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