There were three practice sessions preceding the start of the race on Sunday: two on Friday and one on Saturday. The first two one-hour sessions were on Friday morning and afternoon while the third session on Saturday morning lasted one hour.[6]
The first practice session was held in damp weather.[7]Jordan Taylor set the fastest lap in the No. 10 WTR Corvette DP at 1 minute, 11.158 seconds, 0.985 seconds faster than Tristan Nunez's No. 55 Mazda. Ryan Dalziel in VFR's No. 90 vehicle was third, and Oswaldo Negri Jr.'s No. 60 MSR ligier was fourth.[8] The seven-vehicle PC class was led by PR1/Mathiasen Motorsports's No. 52 car, driven by Tom Kimber-Smith with a time of 1 minute, 13.154 seconds.[7][8] The two Corvette Racing team cars of Oliver Gavin (No. 4) and Antonio García (No. 3) led GTLM. Andy Lally's No. 44 Magnus Audi R8 recorded the fastest time in GTD.[8]
Rain continued to affect the track in the second practice session. Jordan Taylor was fastest with a time of 1 minute, 11.206 seconds, followed by the AER cars of Fittipaldi and Cameron in second and third.[9] A 1:12.131 lap saw Renger van der Zande's No. 8 Starworks vehicle lead PC.[10]Bill Auberlen led GTLM in the No. 25 BMW with a 1-minute, 15.961 lap. Tommy Milner's No. 4 Corvette was second. Müller in the No. 66 CGR Ford GT was third in GTLM.[9] Lally's No. 44 Magnus Audi R8 led GTD, and Spencer Pumpelly, in the No.16 Change Racing Lamborghini, was second in class.[10]
The final practice was held on a dry race track which allowed for faster lap times.[11] Negri's MSR Ligier set the fastest overall lap of 1:10.522, 0.002 seconds faster than Bomarito's No. 55 Mazda.[12][11] van der Zande led the PC class with a 1 minute, 11.884 second lap in Starworks' No. 8 car.[12] Corvette Racing paced GTLM with García's No. 3 car lapping 1:15.233, ahead of the two BMW M6 GTLMs.[12] With a 1:17.888 lap, David led the GTD class in the No. 6 Stevenson Audi R8.[12]
Qualifying
In Saturday afternoon's 90-minute four-group qualifying, each category had separate 15-minute sessions. Regulations stipulated that teams nominate one qualifying driver, with the fastest laps determining each class' starting order. IMSA arranged the grid to put Prototypes ahead of the PC, GTLM and GTD cars.[13][6]
1 The No. 54 CORE Autosport entry was moved to the back of the PC field as per Article 43.1 of the Sporting regulations (Change of starting driver).[13]
2 The No. 44 Magnus Racing entry was moved to the back of the GTD field as per Article 40.1.5 of the Sporting regulations (Change of starting tires).[13]
With a total of 220 points, Barbosa and Fittipaldi's second-place finished allowed them to keep their advantage in the Prototype Drivers' Championship. Curran and Cameron advanced from third to second.[5] The final results of PC allowed Popow and van der Zande to extend their advantage in the Drivers' Championship to 14 points over Alon and Kimber-Smith.[5] Gavin and Milner's fourth-place finish kept them atop the GTLM Drivers' Championship, but their advantage was reduced to 5 points over race winners Briscoe and Westbrook.[5] Balzan and Nielsen's fourth-place finish allowed them to increase their advantage in the GTD Drivers' Championship to 22 points over Farnbacher and Riberas. Davis and Liddell advanced from sixth to fifth while Keen and MacNeil dropped to seventh.[5] Chevrolet and Ferrari continued to top their respective Manufactures' Championships while Action Express Racing, Starworks Motorsport, Corvette Racing, and Scuderia Corsa kept their respective advantages in their of Teams' Championships with five rounds left in the season.[5]
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