Argentina's Juan Martin Del Potro (R) and Leonardo Mayer compete during the Davis Cup World Group final doubles match against Croatia's Marin Cilic and Ivan Dodig in Zagreb, capital of Croatia, Nov. 26, 2016. (Xinhua/Miso Lisanin)
Argentina's Juan Martin Del Potro (R) and Leonardo Mayer compete during the Davis Cup World Group final doubles match against Croatia's Marin Cilic and Ivan Dodig in Zagreb, capital of Croatia, Nov. 26, 2016. (Xinhua/Miso Lisanin)