Japan's Kei Nishikori returns a shot to Russia's Karen Khachanov during their match at the Gerry Weber Open tennis tournament, in Halle, Germany, Thursday, June 22, 2017. (Friso Gentsch/dpa via AP)
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Japan's Kei Nishikori returns a shot to Russia's Karen Khachanov during their match at the Gerry Weber Open tennis tournament, in Halle, Germany, Thursday, June 22, 2017. (Friso Gentsch/dpa via AP)
