French Open champion Li Na of China was knocked out of the U.S. Open on Monday by unseeded Romanian Simona Halep 6-2 7-5.
Li's loss meant all four current women's grand slam champions failed to make the second round of the U.S. Open.
Last year's winner and current Australian Open champion Kim Clijsters did not defend her title because of illness and Wimbledon champion Petra Kvitova was beaten on Monday.
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