Australian Troy Bayliss won both races at Sunday's World Superbikes round in Brno to extend his lead in the overall standings to 79 points.
The Ducati rider won the first race in 40 minutes, 22.724 seconds, with compatriot Troy Corser 1.468 seconds behind for Yamaha.
Michel Fabrizio of Italy, was third on another Ducati.
Bayliss led the second race from start to finish although his winning margin was smaller.
Fabrizio came second - 0.928 behind - and Italy's Max Biaggi was third.
After nine of 14 rounds, Bayliss leads the overall standings with 309 points ahead of Germany's Max Neukirchner with 230 points.