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