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Game, set, retire?

A rash of mid-match withdrawals — 14 and counting as of Saturday afternoon — has pushed the U.S. Open into record territory. Never have more players retired at a Grand Slam tournament in the post-1968 Open era.

And it hasn't even been that hot.

"We've had way hotter, more physical U.S. Opens in the past," says veteran doubles specialist Mark Knowles. "I think it's a bit strange."

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Related Topics: US Open 2011 tennis, tennis