As the leaders came to the chequered flag, Razia had by now built up an unassailable 5s lead over Berthon, who was relieved to have avoided any late race pressure from Valsecchi after all, given that the Italian had his hands full with Calado.
Behind them, Max Chilton was 6.5s back but had managed to salvage that poor race start to deliver a decent fifth place ahead of Giedo van der Garde, who had himself come under late pressure from Esteban Gutiérrez after the Mexican had found his way past a flagging Stefano Coletti to finish in seventh place.
New boy Victor Guerin ran foul of the stewards with a jump start and Marcus Ericsson got done for ignoring yellow flags while running in 11th place, while Serenelli's day ended early after his pit lane start with a self-inflicted spin into the turn 4 gravel trap on the third lap.
The result meant that once again, the top two men in the GP2 drivers championship shared a podium, with Nathanael Berthon the guest star on this occasion. But it confirmed that the title is very much a two horse race at this stage between Davide Valsecchi and Luiz Razia - although with only four weekends out of 12 complete, there's still plenty of time for the balance of power to change in 2012.
Full sprint race results
and GP2 driver and team championships positions