Troy Bayliss clinched his second World Superbike title by finishing fifth in the opening race on Sunday, then capped his title by winning the second race.
Bayliss, an Australian who rides for the Ducati Xerox team, also won the title in 2001.
Alex Barros of Brazil won Race 1 at the Imola circuit on a Honda in 39 minutes, 0.096 seconds. It was Barros' first superbike victory.
James Toseland of Britain, also on a Honda, finished second in 39:04.447.
Andrew Pitt of Australia was third on a Yamaha in 39:06.905.
Bayliss, who was in contention early, clocked 39:11.633. In Race 2, Bayliss finished in 38:57.069 around the Enzo and Dino Ferrari circuit for his 11th win this season.
Barros was second in 38:58.482 and Yukio Kagayama of Japan finished third on a Suzuki in 39:01.424.
Bayliss has an insurmountable 393 points atop the standings with only one more stop on the calendar remaining. Toseland is second with 295 points.
"We worked well at the start of the season," Bayliss said.
"The second half of the season has been up and down, but we have won the title," he said.