North American champions Riccardo Agostini and Trent Hindman won the first Pro and Pro-Am race of the Lamborghini Super Trofeo World Final at Imola.
Loris Spinelli ran second behind polesitter Agostini during the first stint, with Dennis Lind running with the duo after dispatching Edoardo Liberati for third shortly after an early safety car intervention.
Agostini was the first of the leading trio to stop on lap 13 to hand over to Hindman, but once the stops had shaken out he was running second behind Spinelli's team-mate, Mikael Grenier.
The pair ran nose-to-tail after the stops, with Hindman briefly nosing ahead at the end of lap 25 when Grenier ran wide out of Rivazza and took a bite of the gravel - only for Grenier to retake the lead on the brakes into Tamburello.
On the next lap, the pressure told and Grenier ran wide after defending into the first part of Rivazza, allowing Hindman to take the lead into the second of the double left-hander.
There was time for only one more lap in the 50-minute race, with Grenier completing a slow final lap to finish 6.8s behind.
Patrick Kujala, sharing with Richard Antinucci, who moved from eighth to fifth during the first stint, passed Lind's team-mate, Andrea Amici, to secure third place.
Jeroen Mull and Austin Versteeg finished fifth, with Raphael Abbate, sharing with Yuki Nemoto, grabbing sixth from Jonathan Cecotto late on.
Nemoto had a bad first lap at the start of the race, slipping from second to seventh by the time they got into Tamburello and losing two more places during the early stages.
Asia series champions Kai Cozzolino and Afiq Yazid finished just behind in eighth, and even with a 10-second penalty for Cozzolino finished ahead of Michele Beretta and Katherine Legge.
Edoardo Piscopo and Taylor Proto came through to win the Pro-Am class in 10th place, the latter passing Pieter Vanneste during the second stint and going on to win by 3.8s.
It was a closely-fought battle in the class, with Nicolas Gomar and Lucas Mauron just behind.