London, Dec 6 (IANS): World No.1 Novak Djokovic believes it was not improvements to his game but his mentality that helped him win three grand slam titles in 2011.

Reflecting on a hugely successful season, Djokovic believes it was his new-found maturity which made the difference.

"It's true that I have improved but by a very small percentage," Djokovic was quoted as saying in ESPN.

"It's the same game I've had the last couple of years. It's my mental approach on the court that's changed."

"That was the difference. I stepped it up. I matured and said, 'It's my time. I can do it. I can win major titles'. I think luck falls on not just the brave but also the ones who believe they belong there."

After a brief break, Djokovic will return to action next month, when one of his first tasks will be to defend his Australian Open title - the first of 10 title defences in 2012. But Djokovic already has his sights on another prestigious title on the Wimbledon courts in 2012.

"I'm only 24, and I want to have many more successful years, win as many major titles as possible," Djokovic said. "The Olympics are coming up. I want a medal."