Francesco Sini was over a second quicker than anyone else in first practice at the International Superstars Series opener at Monza.
Making his debut in a Chevrolet Lumina for the new Solaris Motorsport team, Sini's fastest time came with on the last of his 10 laps in the 40 minute session.
He was 1.009 seconds ahead of Max Pigoli – who has replaced Sini behind the wheel of a Ferlito Motors Jaguar XF this season, having won at Monza last year in a Mercedes for the Romeo Ferraris team.
Pigoli was 0.073s ahead of the only driver entered by Romeo Ferraris this weekend Andrea Larini, younger brother of former F1 and touring car racer Nicola.
Fourth was 2010 champion Thomas Biagi in the best of the BMWs, while Vitantonio Liuzzi was fifth as he makes his series debut in a CAAL Racing Mercedes. It was another big name debutant next up in sixth with Mika Salo behind the wheel of the Maserati Quattroporte that won the championship last year with Andrea Bertolini.
Pigoli's Jaguar teammate Gian Maria Gabbiani was seventh, with 17-year-old Formula Renault champion Andrea Boffo eighth in a Mercedes. BMW drivers Paolo Moloni and Stefano Gabellini completed the top ten.
Nico Caldorola was 11th in his Mercedes, ahead of Gianni Morbidelli in the brand new Audi RS5, some 3.8 seconds off the pace. Liuzzi's teammate Max Mugelli was 13th, ahead of Salo's teammate Mauro Cesari.