An arm injury has forced Serbian star Novak Djokovic to retire while he was trailing by one set to Tomas Berdych of Czech Republic in the men's singles quarter-finals of the Wimbledon tennis tournament.
Three-time Wimbledon champion Djokovic had medical timeout after losing the first set 6-7 (2) here on Wednesday evening. But when he was 0-2 down in the second set, he decided to withdraw after 63 minutes of contest, reports Efe news agency.
Berdych, a finalist at the 2010 edition of Wimbledon, advanced to the semi-finals at the All England Club for the second time in a row and for the seventh time in Grand Slams.
The 31-year-old Czech will take on Swiss star Roger Federer for a place in the final.
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