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Serena Williams returns a shot to Kaia Kanepi
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Serena Williams returns a shot to Kaia Kanepi of Estonia during their 2014 U.S. Open women's singles match at the USTA Billie Jean King National Tennis Center Sept. 1, 2014.(Credit: Getty Images / Timothy A. Clary)

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Funny faces at the U.S. Open

Here's the thing about technology and cameras and shutter speeds: They catch tennis players at the U.S. Open making some outrageous faces.