Bowmanville, Ont. — Lawson Aschenbach was fastest in Friday morning’s GTS practice at Canadian Tire Motorsport Park, at the Pirelli World Challenge Grand Prix of Canada presented by Audi. The 30-minute session was held under clear, sunny 45-degree weather.

Opening the session, Jack Roush Jr., driving the No. 60 Roush Performance Ford Boss 302, set a fastest time of 1:25.995.

Nate Stacy, driving the No. 14 Roush Performance Road Racing Ford Boss 302, then went to the top of the time sheets with a fast lap of 1:25.227 around the challenging road course to lead a Ford one-two on the time sheets.

Roush improved his time, becoming the first into the 1:24 mark, with a lap of 1:24.596 coming just seven minutes into the session.

GTS Championship points leader Aschenbach, in the No. 10 Blackdog Speed Shop Chevrolet Camaro, then went to position one on timing and scoring, with a lap of 1:24.416 leading Roush, while Parker Chase, driving the No. 19 Performance Motorsports Group Ginetta GT4, jumped to third at 1:25.089 before being eclipsed by Scott Dollahite, in the in the No. 46 SDR Motorsports Lotus Evora, who then went to third with a lap of 1:24.979.

With the shuffling going on, Aschenbach then lowered his fast time in the cool morning conditions, with a quick time of 1:23.920 and then to a 1:23.856, ahead of a charging Max Riddle, of Vancouver, BC, driving the No. 07 TRG-AMR Adobe Road Winery, LaSalle Solutions Aston Martin Vantage GT4, who went second quick with a lap of 1:24.181.

With the checkered flag out, Aschenbach paced the early-morning session with his 1:23.856 time, while, Brett Sandberg, in the No. 13 ANSA Motorsports KTM X-Bow GT4, was second fastest with a time of 1:24.137. Roush Jr., Riddle and Chase followed to complete the top five.

GTS drivers next take to the track for qualifying at 11:30am Eastern. Follow live timing and scoring world-challenge.com.