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Jo-Wilfried Tsonga of France gestures after winning against Steve Darcis of Belgium during the match of Davis Cup Final between France and Belgium in Lille, France, Nov. 24, 2017. Tsonga won the game 3-0. (Xinhua/Ye Pingfan)

Jo-Wilfried Tsonga of France gestures after winning against Steve Darcis of Belgium during the match of Davis Cup Final between France and Belgium in Lille, France, Nov. 24, 2017. Tsonga won the game 3-0. (Xinhua/Ye Pingfan)