NEW YORK (AP) — CoCo Vandeweghe double-faulted 12 times and is gone in the first round of the U.S. Open a year after making it all the way to the semifinals.
The 24th-seeded American lost to Kirsten Flipkens of Belgium 6-3, 7-6 (3).
Vandeweghe made a total of 35 unforced errors, 16 more than Flipkens.
At the 2017 U.S. Open, Vandweghe was one of four Americans in the semifinals.
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Australian Open champion Caroline Wozniacki easily reached the U.S. Open's second round by beating 2011 titlist Sam Stosur 6-3, 6-2.
The No. 2 Wozniacki is the highest-seeded woman left in the field after No. 1 Simona Halep lost her opening match.
Wozniacki was the runner-up at Flushing Meadows in 2009 and 2014.
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