As it happens, Biaggi remained fourth for 13 points, but while his lead is now up from 9.5 points to 14.5 points, it is Sykes on his tail now in second place. Melandri, meanwhile, is now 22.5 points adrift in third.
Behind McCormick, Rea finished sixth, the Ulsterman enduring an odd race that saw him up front at the very beginning before dropping back, only to get into the fourth place fight during the closing laps.
Fresh from the announcement he will remain a Kawasaki rider in 2013, Loris Baz celebrated with a solid run to seventh, ahead of Hiroshi Aoyama, who equalled his best result of the season in eighth position.
BMW Italia duo Ayrton Badovini and Michel Fabrizio
completed the top ten, while Leon Camier – who was eighth at the restart – slipped to 11th.
His Suzuki team-mate John Hopkins finished 12th, ahead of a bemused Laverty, the Irishman having begun the restarted race from pole position, only to drop back quickly in the early stages. He eventually crossed the line in 13th, just ahead of Alexander Lundh and Matteo Baiocco.
Compounding BMW's awful start to the day, Leon Haslam endured a terrible race after running off track on the first lap of race one, leaving him at the back of the field. He was then handed a ride-thru penalty for jumping the restart.