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Western & Southern Open on Twitter: "Moving on... Reilly Opelka is forced to retire. Stefanos Tsitsipas advances to the semifinals 6-5 ret. #CInCyTENNIS https://t.co/uQZDgmrJnd" / Twitter
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Reilly Opelka claims Stefanos Tsitsipas "can do anything he wants" with his forehand, says the 'serve-bot' term is "pretty stupid"
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