Novak Djokovic has refused to rule out becoming the first male tennis player to win a 'Golden Slam' this season.
The Serbian world number one could become only the fourth person to hold all four grand slams at the same time if he wins the French Open in early June.
But he is hoping to go one better, admitting he would like to outdo his achievement last season when he claimed the Australian, U.S and Wimbledon titles.
"I think everything is possible," Djokovic said. "I have to stay optimistic. I have to believe in what I do and believe in my abilities and that I can win on all surfaces.
"Obviously, Roland Garros is the one to win this year. All the grand slams and Olympic Games, they are my priorities."