SINGAPORE (AP) Maria Sharapova's chances of claiming the season-ending No. 1 ranking were hurt Tuesday after a 7-6 (4), 6-7 (5), 6-2 loss to Caroline Wozniacki at the WTA Finals.
The match included 12 breaks of serve.
Wozniacki beat Sharapova for the second straight time. The Dane also won in the fourth round of this year's U.S. Open.
Sharapova needs to at least reach the final in Singapore to have a chance of overtaking Serena Williams and finishing the season with the top ranking for the first time.
In Tuesday's other White Group match, Wimbledon champion Petra Kvitova will face Agnieszka Radwanska.