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Roger Federer of Switzerland celebrates after winning the quarterfinal of ATP Mercedes Cup tennis tournament against Guido Pella of Argentina in Stuttgart, Germany on June 15, 2018. Roger Federer won 2-0. (Xinhua/Philippe Ruiz)
Roger Federer of Switzerland celebrates after winning the quarterfinal of ATP Mercedes Cup tennis tournament against Guido Pella of Argentina in Stuttgart, Germany on June 15, 2018. Roger Federer won 2-0. (Xinhua/Philippe Ruiz)