Championship contenders showed good pace in all three classes in the opening two practice sessions at Road Atlanta on Thursday.
Jack Hawksworth took his fourth GT Daytona class pole of the season for 3GT Racing in the #15 Lexus RC F GT3 during qualifying for the 2018 Michelin GT Challenge at VIR.
Ford GT took victory in Lime Rock Park following a late-race error by Jan Magnussen while lapping traffic
Antonio Garcia delivered a stunning lap to take pole position for the Northeast Grand Prix at Lime Rock
Jack Hawksworth has stuck the Lexus RC F GT3 on pole in the GTD class at the Canadian Tire Motorsport Park on Saturday.
Helio Castroneves was quickest in Qualifying at Mid-Ohio, while BMW Team RLL and 3GT Racing took pole honours in the two GT classes.
Dane Cameron confirmed Acura Team Penske as the team to beat this weekend in Mid-Ohio as he led the way in final practice on Saturday morning.
Tristan Vautier, Connor de Phillippi and Daniel Serra all set class lap records at Sebring to take pole position for Saturdays Mobil 1 Twelve Hours.
Ricky Taylor ensured Acura Team Penske remained on top for a second consecutive practice session at Sebring on Thursday.
Action Express Racing ended day two of the Roar Before the 24 with the quickest time, as the four Cadillac teams took the top four fastest times. Fernando Alonso experienced his first ever racing laps at night as he continues to settle into Sports Car Racing.
The Wayne Taylor Racing Team dominated the fourth round of the IMSA Wethertech Sportscar Championship at the Circuit of the Americas. The WTR Cadillac took an easy win, while the GTLM field was decimated in a first corner crash.
With few front-running seats available on the 2017 IndyCar grid it is expected that the final drive with Chip Ganassi Racing will go to one of two drivers, Max Chilton or Felix Serralles.
Jack Hawksworth suffered more disappointment as he ended his second season with AJ Foyt Racing without a top ten finish having finished eighteenth at Sonoma.
Helio Castroneves was fastest in both free practice sessions on Friday in Sonoma, while championship rivals Will Power and Simon Pagenaud both showed good pace.
It was another frustrating day for Jack Hawksworth at Watkins Glen on Sunday as the Briton continues to seek his first top ten finish of 2016.