Juan Martin Del Potro has said that he will need to be at his best to beat Novak Djokovic ahead of Thursday's Wimbledon semi-finals.
Del Potro has suffered with a series of nasty slips and picked up a knee injury when he charged down a drop-shot against Grega Zemlja in the last 16.
He then seemed to worsen the injury against David Ferrer in the first game of yesterday’s quarter-final, but the Argentine battled back to win in straight sets to set up a tie against Djokovic.
But Del Potro is under no illusions of how hard his task will be if he is to knock out the number one seed and reach the Wimbledon final. He told reporters: “I will need to be 100% or 110% against him.
“He’s the No. 1. He’s a former champion here. It’s going to be more difficult match for me. But if I’m okay, if I do everything good to be ready for my next match, I will be exciting to play against him. I remember the match during the Olympic last year on the same surface.
“I will try to be ready and do my best.”
Del Potro has been in fine form this week and seems to be hitting the ball as cleanly as ever – with the usual power in his groundstrokes and serves proving a big threat.
He is first on Centre Court tomorrow against the Serbian superstar before Andy Murray takes on Jerzy Janowicz.
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