Djokovic books place in semi-finals

World number one Novak Djokovic books his place in the semi-finals of Wimbledon with a comfortable straight sets victory over Tomas Berdych.

Djokovic, who has yet to drop a set in the tournament, won 7-6 (7-5) 6-4 6-3 and will face Argentine Juan Martin del Potro on Friday.

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