American world number 13 John Isner has withdrawn from next week's Australian Open with a knee injury, tournament organisers said.
American John Isner returns a shot against compatriot Ryan Harrison at the Sydney International on January 9, 2013. The world number 13 Isner has withdrawn from next week's Australian Open with a knee injury, tournament organisers said on Thursday.
The big-serving Isner, who was seeded 12 at the first Grand Slam of the season, injured his right knee during the Hopman Cup in Perth last week and was forced to withdraw from the event.
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