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LONDON, July 12 (Reuters) - Three-times Wimbledon champion Novak Djokovic retired injured during his quarter-final against Czech Tomas Berdych on Wednesday.
The second seed had just lost the opening set and was down a break in the second when he walked to the net and shook Berdych's hand, having received a medical timeout.
He appeared to be struggling with an arm injury.
Reporting by Martyn Herman