TENNIS PHOTOS

  • In this Sunday, Sept. 25, 2016 photo, Caroline Wozniacki of Denmark celebrates after winning over Naomi Osaka of Japan during their final match of the Pan Pacific Open tennis tournament in Tokyo. (AP Photo/Shizuo Kambayashi, File)

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  • Alexander Zverev of Germany returns the ball to Stan Wawrinka of Switzerland during the St. Petersburg Open ATP tennis tournament final match in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Alexander Zverev of Germany poses with his trophy after winning the St. Petersburg Open ATP tennis tournament final match against Stan Wawrinka of Switzerland in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Finalists of the St. Petersburg Open ATP tennis tournament, second placed Stan Wawrinka of Switzerland, left, and winner Alexander Zverev of Germany, hold their trophies during the ceremony in St.Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Finalists of the St. Petersburg Open ATP tennis tournament, second placed Stan Wawrinka of Switzerland, right, and winner Alexander Zverev of Germany, hold their trophies during the ceremony in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Stan Wawrinka of Switzerland holds his second place trophy after being defeated by Alexander Zverev of Germany in the St. Petersburg Open ATP tennis tournament final match in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Alexander Zverev of Germany holds up the trophy after winning the St. Petersburg Open ATP tennis tournament final match against Stan Wawrinka of Switzerland in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Alexander Zverev of Germany kisses the trophy after winning the St. Petersburg Open ATP tennis tournament final match against Stan Wawrinka of Switzerland in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Alexander Zverev of Germany celebrates his victory over Stan Wawrinka of Switzerland in the St. Petersburg Open ATP tennis tournament final match in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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  • Alexander Zverev of Germany kisses the trophy after winning the St. Petersburg Open ATP tennis tournament final match against Stan Wawrinka of Switzerland in St. Petersburg, Russia, Sunday, Sept. 25, 2016. (AP Photo/Dmitri Lovetsky)

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