Djokovic has a mountain to climb after four losses to Tsonga

Djokovic has a mountain to climb after four losses to Tsonga Miami  - Novak Djokovic will aim to reverse a run of four consecutive defeats against Frenchman Jo-Wilfried Tsonga as the pair meet in the quarter-finals of the Miami Masters.

Third seed and 2007 champion Djokovic controlled Czech Tomas Berdych in an efficient 6-3, 6-2 victory on Tuesday, while Tsonga, seeded 10th, ousted compatriot Gilles Simon 6-7 (4-7), 6-3, 6-2 in their fourth-round meeting.

Djokovic and Tsonga played the 2008 Australian Open final, which the 21-year-old Serb claimed as his only Grand Slam title. But in the 15 months since that meeting Tsonga has gotten plenty of revenge with ATP victories in Bangkok, Paris, Shanghai and Marseille.

"I've lost to him four times in a row, so he has a little advantage there," said the 20-7 Serb. "But all the matches were very close. It's going to be a challenge for me to win.

Djokovic broke Berdych five times as the Czech failed to capitalize after knocking out 13th seed James Blake in the previous round.

But the winner said that the scoreline was deceptive.

"Nothing is easy at this stage of the tournament. I'm playing a top 20 player, and a player who won against basically all top players in this moment.

"I was trying to stick with him all the time, because I knew he's very aggressive, but not really consistent from the baseline. He makes a lot of unforced errors, especially from the forehand side, so I changed the pace and I played a really good tennis today."

Djokovic has been struggling for confidence after failing to defend his Melbourne Grand Slam title and so far winning only one title in Dubai in 2009.

His Miami victory marked his 10th at the event. "Wins are necessary to get the confidence, and this is what I'm getting lately. Luckily for me, I'm winning more matches then I'm losing.

"Winning Dubai and a couple matches at Indian Wells and here again, so far it's going well."

The French top 10 pair of Tsonga and Simon are now level at a win apiece after Tsonga's victory in two hours, 10 minutes, with nine aces and three breaks of serve. (dpa)

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