Serena knocks off 4th-seeded Azarenka (AP)

Mardy Fish signs autographs after his match against Kevin Anderson of South Africa during the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011.

If anyone still harbored any doubts about whether Serena Williams is back at her best, she put on a pretty persuasive performance during the first 17 minutes of her third-round match Saturday at the U.S. Open. That's how long Williams needed to build a 5-0 lead en route to a 6-1, 7-6 (5) victory at Flushing Meadows over one of the best players the women's field had to offer: fourth-seeded...


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