Michael Cooper set the pace on Friday for the Pirelli World Challenge round at Sonoma with a time of 1:33.216 during Practice 2 in his Cadillac ATS-V.R GT3.
Cadillac Racing team-mate Johnny O’Connell took second in the afternoon session, but wasn’t quite as fast as Austin Cindric’s morning lap time.
Alvaro Parente was third quickest in the second session, with Adderly Fong fourth, for K-PAX Racing and Bentley Team Absolute respectively.
Michael Schein went quickest in GTA for Wright Motorsports in the No. 16 Porsche 911 GT3 R, bettering his Practice 1-topping time, while Martin Fuentes took second in his Scuderia Corsa Ferrari F458 Italia GT3.
Cooper MacNeil, meanwhile, was third in the No. 79 Alex Job Racing Porsche.
Alec Udell topped GT Cup with a time exactly one second faster than the morning’s pacesetter, Mike Hedlund.
Sloan Urry was second in the TruSpeed Autosport car, behind the GMG driver.
Qualifying for GT is set for 9:55 a.m. PT on Saturday.
RESULTS: Practice 2