Colin Braun led the way in opening practice for Sunday’s Mobil 1 Sportscar Grand Prix at Canadian Tire Motorsport Park, in the first official track action for IMSA WeatherTech SportsCar Championship competitors.

Braun laid down a 1:07.155 lap time in the No. 54 CORE autosport Oreca 07 Gibson, breaking the previous track qualifying record, to outpace out the No. 6 Team Penske Acura ARX-05 of Dane Cameron by 0.916 seconds.

The No. 5 Action Express Racing Cadillac DPi-V.R of Filipe Albuquerque was third quickest, followed by the No. 55 Team Joest Mazda RT24-P of Jonathan Bomarito in fourth.

Felipe Nasr completed the top-five in the No. 31 Action Express Cadillac DPi.

The Prototype session came to an early end following an accident by the No. 38 Performance Tech Oreca of Kyle Masson, who made contact with the tire barriers in Turn 1.

Significant rear-end damage was sustained to the LMP2 car and comes following a rebuild from the team’s race-ending accident last weekend at Watkins Glen.

Bamber Leads Porsche 1-2 in GTLM

Porsche topped the time charts in GT Le Mans, with Earl Bamber outpacing teammate Nick Tandy.

Bamber reeled off a 1:14.538 in the No. 912 Porsche 911 RSR, which was nearly a half-second quicker than the No. 911 car.

The pair of Corvette C7.Rs were third and fourth on the time sheets, followed by the two Chip Ganassi Racing Ford GTs.

Bill Auberlen, meanwhile, posted the quickest time in GT Daytona, in the No. 96 Turner Motorsport BMW M6 GT3.

Auberlen, who makes his return to the Will Turner-led team, clocked a 1:16.848 lap to edge out the No. 15 3GT Racing Lexus RC F GT3 of Jack Hawksworth by 0.081 seconds.

The second and final practice session of the day is scheduled for 3:50 p.m. EDT.

RESULTS: Practice 1