The second seed at the ATP-WTA Madrid Masters has not been beaten at all in 2011 and owns five titles coming into his first serious clay test of the spring as the French Open start on May 22 draws near.
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"I don't think it's realistic to go without a defeat in the first for months of the season," admitted the Serb as he prepared to face an opening match against South African Kevin Anderson, a winner over Olivier Rochus in the first round 6-2, 6-4.
"But anything is possible if you believe you can achieve it and you are fit physically and mentally fresh, motivated and dedicated to the sport," said the World No 2 behind Rafael Nadal.
"I've been working very hard on my game, my mental approach over the past few years and now it's paying off. There is no secret."
But Djokovic does not believe his dream can go on forever. "I don't believe I can win every match on clay, but I'll take it one match at a time and we'll see how far it can go," he added.
