The BQR Suzuki rider won the race on his GSX-R1000, marking his third victory of the six rounds so far held, while main competitor Carmelo Morales finished seventh.
"That was a perfect weekend," said the 29-year-old. "I'm very happy because I leave as a champion. This is my fourth title in five years and I am grateful to my family, the team, Dunlop and all who have supported me during these years.
"This year was a challenge as the team changed brand to Suzuki, but I believe we have worked well, we developed the machine quickly and we have been fast. When we arrived at the circuits, all were new, but thanks to the effort of everybody; we were at the top in all the races and won our third championship in a row.
"Next year I will race in the Supersport World Championship; a new challenge for me but think I can do it well," declared the former grand prix rider.