2018 Continental Tire Road Race Showcase

[3] With 208 points, the GTLM Drivers' Championship was led by Joey Hand and Dirk Müller with a one-point advantage over Antonio García and Jan Magnussen.

[6] In P, the Cadillac DPi-V.R gained a 0.9 mm larger air restrictor while the Mazda RT24-P and Nissan Onroak DPi got an increase of turbo boost.

[7] In P, João Barbosa returned to the #5 Mustang Sampling Racing after missing the previous two rounds due to injury.

[8] Tequila Patrón ESM brought its #2 entry back after it skipped the Canadian Tire Motorsport Park round.

[9] In GTD, Squadra Corse Garage Italia and Park Place Motorsports made their first appearances since the Watkins Glen round.

[12] All three categories had 15-minute individual sessions, and regulations stipulated teams to nominate a single driver to qualify their cars.

The competitors' fastest lap times determined the starting order with the grid arranged to put the Prototype and GTLM cars ahead of all GTD entries.

[23] The #22 Nissan Onroak DPi of Pipo Derani lapped fastest at 1:53.080 ahead of Ricky Taylor in the #7 Acura.

The fastest GTLM lap was a 2:04.597, set by Antonio García in the #3 Corvette, and Jörg Bergmeister's #73 Porsche paced GTD.

The #67 Ford Chip Ganassi Racing entry took the lead of the GTLM Teams' Championship with three rounds remaining.