After tennis champion Rafael Nadal’s humiliating Wimbledon defeat to Czech world 100 Lukas Rosol, Novak Djokovic warned on Friday that this was a wake-up call for the game's superstars.

The world's top three players, Djokovic, Nadal and Roger Federer; have won 31 of the last 34 Grand Slam titles, a streak stretching back over seven years. But Nadal's shock second round 6-7 (9/11), 6-4, 6-4, 2-6, 6-4 defeat to journeyman Rosol was the Spaniard's worst performance at a major since losing to Gilles Muller of Luxembourg at the same stage of Wimbledon in 2005.

"You cannot take anybody for granted. You can't underestimate any opponent. I don't think Rafa did, he's well aware of the quality of all the players on the tour. But it's a Grand Slam. It's Wimbledon. Everybody wants to come up with their best game, especially when you're playing one of the top players. You have nothing to lose. You're out there on the court and you're going for your shots," said defending champion Djokovic.

He adds further, "It can serve as an example for everybody that anything is possible in this sport. Even though myself, Rafa, Roger, Murray, we've been dominant in Grand Slams, and it's expected of us to reach the last four. But tennis is improving. Everybody plays equally well."

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Source: TNN