Li Na Reaches Fourth Round At Sony Open

KEY BISCAYNE (AP) — Li Na overcame three set points Sunday to rally past American Madison Keys 7-6 (3), 6-3 and reach the fourth round at the Sony Open.

The No. 2-seeded Li, the reigning Australian Open champion, won despite struggling with her second serve. She had seven double-faults and was broken four times.

Keys failed to convert her set points serving at 5-3 in the first set. She also squandered a lead in the second set, when three times she was within a point of going up 3-love.

American CoCo Vandeweghe earned a shot at Serena Williams in the fourth round by winning a match that ended at 2:29 a.m. Vandeweghe, a qualifier ranked No. 104, rallied past 2011 U.S. Open champion Samantha Stosur 5-7, 7-5, 7-5.

The match began shortly before midnight Saturday and ended with a handful of spectators in the stadium.

Vandeweghe has never previously been beyond the first round at Key Biscayne. She'll play the top-ranked Williams on Monday.

(©2014 CBS Local Media, a division of CBS Radio Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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