World number one Novak Djokovic landed his ninth title of 2011 with a hard-fought win over American Mardy Fish in the final of the ATP Rogers Cup in Montreal.

The 24-year-old Serbian, who has won 53 of the 54 matches he has played this year, beat Fish 6-2 3-6 6-4.

He broke Fish's serve in the fifth game of the deciding set and held on to the advantage that gave him.

With his success, Djokovic has become the first player to win five ATP Masters 1000 events - tournaments at the level just below the grand slams - in the same season.

Djokovic's previous Masters 1000 wins this season came in Indian Wells, Miami, Madrid and Rome, and on each occasion it was Rafael Nadal he beat in the final - just as it was at Wimbledon last month.

By reaching the Wimbledon final, Djokovic inherited the number one ranking from Nadal.

He has dominated the current season and will go to the US Open as firm favourite for another grand slam title, but there were nerves from Djokovic against Fish.

"I think I was more nervous than in the previous matches today," Djokovic said on