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OSAKA, JAPAN - SEPTEMBER 16: Dayana Yastremska of the Ukraine hits a return shot against Anastasia Pavlyuchenkova of Russia during day one of the Toray Pan Pacific Open at Utsubo Tennis Cent on September 16, 2019 in Osaka, Japan. (Photo by Koji Watanabe/Getty Images)

OSAKA, JAPAN - SEPTEMBER 16: Dayana Yastremska of the Ukraine hits a return shot against  Anastasia Pavlyuchenkova of Russia during day one of the Toray Pan Pacific Open at Utsubo Tennis Cent on September 16, 2019 in Osaka, Japan. (Photo by Koji Watanabe/Getty Images)