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Mikhail Kukushkin of Kazakhstan hits a return during the Davis Cup singles at World Group quarterfinal between Croatia and Kazakhstan in Varazdin, Croatia, on April 6, 2018. Mikhail Kukushkin won 3-1. (Xinhua/Sanjin Strukic)
Mikhail Kukushkin of Kazakhstan hits a return during the Davis Cup singles at World Group quarterfinal between Croatia and Kazakhstan in Varazdin, Croatia, on April 6, 2018. Mikhail Kukushkin won 3-1. (Xinhua/Sanjin Strukic)