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1/3 Trainers examine Naomi Osaka, of Japan, after she suffered a knee injury in her match against Sofia Kenin, of the United States, in the quarterfinals of the Western & Southern Open tennis tournament in Mason, Ohio, Aug 16, 2019. (KAREEM ELGAZZAR / THE CINCINNATI ENQUIRER VIA AP)
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2/3 Ashleigh Barty, of Australia, serves to Maria Sakkari (not in frame), of Greece, during the Western & Southern Open tennis tournament, in Mason, Ohio, Aug 16, 2019. (JOHN MINCHILLO / AP)
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3/3 Novak Djokovic, of Serbia, returns to Lucas Pouille (not in frame), of France, during the Western & Southern Open tennis tournament in Mason, Ohio, Aug 16, 2019. (JOHN MINCHILLO / AP)