Posted January 09, 2013 on AP on Fox

AUCKLAND, NEW ZEALAND - JANUARY 16: John Isner of USA plays a forehand during his final match against Arnaud Clement of France on day six of the Heineken Open at the ASB Tennis Centre on January 16, 2010 in Auckland, New Zealand. (Photo by Hannah Johnston/Getty Images)
John Isner has withdrawn from the Australian Open with bone bruising in his right knee, leaving No. 22 Sam Querrey as the highest-ranked U.S. man at the season's first Grand Slam tournament. Isner, who spent 18 weeks in the top 10 before finishing last year at No. 14, injured his knee at the Hopman Cup in Perth last week and had to withdraw from the international mixed team competition. He tried playing at the Sydney International, where he was seeded No. 1, but lost to fellow American Ryan Harrison in straight sets in 71 minutes on Wednesday. ''I have been feeling some discomfort in my knee and have recently learned that I have a bone bruise,'' Isner said in a statement released by Australian Open organizers on Thursday. ''Doctors have told me that continuing to play on the knee could result in a more serious injury.'' The big-serving American led the tour in aces (1,005) and won two titles in 2012. He beat defending Australian Open champion Novak Djokovic to reach his first AT...
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