Romain Grosjean put Lotus at the top of the time sheets in Saturday morning practice ahead of Ferrari's Fernando Alonso, before a late yellow for a crash by Sergio Perez in the McLaren.
Davide Valsecchi clinched the 2012 GP2 Series championship over Luiz Razia, while Max Chilton won the Saturday feature race in Singapore ahead of Esteban Guti?rrez.
Max Chilton followed through on his first GP2 Series pole position to successfully convert it into his maiden victory, despite intense late pressure from Davide Valsecchi.
Arden's Luiz Razia looked to have lost touch with the pack of five leaders in the Sunday sprint race, but then surged to the front in a thrilling finish to an eventful Valencia sprint race.
Lotus GP's Esteban Guti?rrez was back on the top step of the podium for the first time in a year, after a succession of safety cars denied his team mate James Calado victory.