Simona Halep has become the first No. 1-seeded woman to lose in first round of the U.S. Open in the professional era.
Halep was beaten 6-2, 6-4 by 44th-ranked Kaia Kanepi of Estonia on Monday in a match that was stunningly lopsided and lasted all of 76 minutes.
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It was the first match at the rebuilt Louis Armstrong Stadium.
Halep won the French Open in June for her first Grand Slam title.
But this is the second year in a row she exits the U.S. Open in the first round.