Indian Wells:Novak Djokovic has been the game's top player for more than a year, but the Serbian is not taking his world number one ranking for granted.

Djokovic, who has clinched four of the last five grand slams and posted a remarkable win-loss record of 70-6 in 2011, is well aware that fortunes can change very quickly in the sport. "I don't consider myself being on the top of the world, being untouchable or unbeatable," the 24-year-old told reporters on Friday.

"That's out of the question. I always try to give 100 per cent in every practice that I have, I always want to have the positive mindset in preparing well for every event, for every season."

Asked what had been his proudest achievement since the start of his red-hot run last year, Djokovic replied: "I'm very, very proud of my consistency, the results throughout the whole year. But the biggest success was Wimbledon, winning that title, winning the tournament that I always dreamed of winning, so I guess I can take that out as my proudest." Djokovic, who outlasted Spaniard Rafa Nadal 5-7 6-4 6-2 6-7 7-5 in an epic final at the Australian Open in January, will be aiming for a fourth consecutive grand slam crown at the French Open in June.

Uphill task

Roland Garros has always been his favourite grand slam venue, but he knows he will face an uphill task their on its claycourt surface in a tournament he has yet to win.

"I've had a good couple of years playing in Roland Garros, unfortunately I didn't reach the finals yet in Paris," Djokovic said. "I have played three semi-finals there, mostly against Rafa, and had some really good matches there. I love playing at Roland Garros, so hopefully this year I can make at least a step further." While Djokovic accepted there would be speculation about a calendar year grand slam following his successful title defence at the Australian Open, he prefers to let others do the talking.

"The fact is that there is always pressure and always expectations for somebody who is a top player, and it's something that you can understand and expect," the Serb said.