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Jack Sock of the United States serves during the singles final against Filip Krajinovic of Serbia at the ATP World Tour Masters 1000 Indoor tennis tournament in Paris, France, Nov. 5, 2017. (Xinhua/Chen Yichen)
Jack Sock of the United States serves during the singles final against Filip Krajinovic of Serbia at the ATP World Tour Masters 1000 Indoor tennis tournament in Paris, France, Nov. 5, 2017. (Xinhua/Chen Yichen)