Serbia's Novak Djokovic beat Argentina's Juan Martin del Potro 6-1, 3-6, 7-6 (7-3) in the Shanghai Rolex Masters final on Sunday, completing the successful defense of his title.

Djokovic, who won the title in Beijing last week, battled Del Potro for two hours and 32 minutes to wrap up his Asian tour with another championship.

"All the way up to the last point, I didn't know if I was going to win the match. It was a very even match. My motivation is there always, especially when I'm playing finals of such a big event," the 26-year-old Djokovic said.

Djokovic had won the Australian Open, Dubai, Monte Carlo and Beijing going into Sunday's final.

Next up for the world No. 2 is the Paris Masters, where Spain's David Ferrer is the defending champion.

"The match was really close and I think Nole played (some) unbelievable points in the tie-break," the 25-year-old Del Potro said. "The match was so exciting. At Wimbledon, we played another fantastic match against each other."

Del Potro advanced to the final by upsetting Spanish world No. 1 Rafael Nadal 6-2, 6-4 on Saturday.

With the win, Del Potro also booked a spot in the eight-man ATP World Tour Finals for the fourth time.

The year-end event will get underway next month at the O2 Arena in London.

Djokovic, who is riding a 12-match winning streak and has won 20 straight matches in China, earned $729,725 for his win in Shanghai.

The Shanghai Rolex Masters is one of the biggest hard-court events on the ATP World Tour calendar and the season's top tournament played in Asia. EFE