Aug 13, 2014; Cincinnati, OH, USA; Serena Williams reacts during the match against Samantha Stosur on day three of the Western and Southern Open tennis tournament at Linder Family Tennis Center. Mark Zerof-USA TODAY Sports
(Reuters) - World number one Serena Williams won a tense battle of U.S. Open champions by beating Australia's Samantha Stosur 7-6(7) 7-6(7) on Wednesday to reach the third round of the Western and Southern Open in Cincinnati.
After last week's loss to sister Venus in the Montreal seni-finals, Williams faced another familiar foe in Stosur, who had beaten her in straight sets in the 2011 U.S. Open final.
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