Extreme Speed Motorsports and OAK Racing led the way in opening TUDOR United SportsCar Championship practice for Sunday’s Sahlen’s Six Hours of The Glen.

Ryan Dalziel took the No. 1 HPD ARX-03b to the top of the time charts in the 60-minute session, reeling off a best lap of 1:39.918 in his P2 entry.

Dalziel’s time edged out the No. 42 OAK Racing Morgan-Nissan of Alex Brundle by 0.539 seconds, with the No. 90 Spirit of Daytona Corvette of Michael Valiante third quickest, and best of the DPs but more than seven-tenths off the pace.

8Star Motorsports topped the time charts in Prototype Challenge, with Tom Kimber-Smith pedaling the No. 25 Oreca FLM09 to a quick lap of 1:42.55, which was good enough for 10th overall.

The No. 54 CORE autosport and No. 8 Starworks Motorsport entries were second and third in class, respectively.

BMW Team RLL went 1-2 in GT Le Mans, with the No. 55 BMW Z4 GTE of Andy Priaulx quickest with a 1:45.652 on his final flying lap.

The No. 56 BMW, driven by John Edwards, was second, followed by the No. 911 Porsche North America Entry of Nick Tandy, who completed the top-three in class.

Alex Job Racing was quickest in GT Daytona, thanks to Leh Keen’s 1:50.322 in the No. 22 Porsche 911 GT America.

The 60-minute session saw only one red flag, due to the No. 33 Riley Motorsports Dodge Viper GT3-R, which stopped on track in Turn 10.

Two additional practice sessions are on tap for Saturday, followed by qualifying in the evening.

RESULTS: Practice 1