Serena Williams' U.S. Open penalties spark debate over sexism in sports
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Djokovic snaps at Wimbledon chair umpire en route to Week 2
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Serena Williams calls out sexism in tennis | The Chatterbox
At the U.S. Open, that voice yelling 'Out!' comes from a computer | Reuters
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Commentary: Tennis technology erases John McEnroe-esque fun - Los Angeles Times
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The U.S Open replaces human line judges with optical technology : NPR
