U.S. Tennis Association announced Saturday for the competition that starts Tuesday in Zhuhai, China.
Taylor Fritz, Frances Tiafoe not on the American roster for the Davis Cup
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U.S. Tennis Association said that Nadal's place in the tournament would be taken by Mackie McDonald, the American who is No. 93, making him the highest-ranked man not yet in the field.
Rafael Nadal pulls out of U.S. Open, will miss third Grand Slam tournament this year
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