John Isner withdraws with knee injury
MELBOURNE, Australia -- John Isner has withdrawn from the Australian Open with bone bruising in his right knee, leaving No. 22 Sam Querrey as the highest-ranked U.S. man at the season's first Grand Slam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, ...
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