Slowed by a right knee injury, eighth-seeded Caroline Wozniacki failed to make it out of the first round of her second straight Grand Slam tournament, falling 6-2, 6-2 to 96th-ranked Irina-Camelia Begu of Romania at the US Open on Tuesday.
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Wozniacki quit after the first set of her semifinal match last Friday in New Haven. Four days later, she was ousted from the US Open, finishing the match with tape that trainers applied to her hurting knee during an injury timeout in the second set.
Begu recorded her first US Open win.
Wozniacki was the top seed at Flushing Meadows the last two years but fell in the semifinals both times.
Earlier this summer at Wimbledon, she lost her first-round match to Tamira Paszek.