Sam Stosur defeated Svetlana Kuznetsova 6-1, 7-5 in round 1 of the Western & Southern Open.
Sam Stosur defeated Svetlana Kuznetsova 6-1, 7-5 in round 1 of the Western & Southern Open.
Andy Lyons/Getty Images

MASON, Ohio (AP) -- Former U.S. Open champion Sam Stosur moved into the second round of the Western & Southern Open with a 6-1, 7-5 win over Svetlana Kuznetsova on Monday.

Stosur, who won the 2011 U.S. Open, lost in the round of 16 at the Rogers Cup in Toronto last week. She won the Southern California Open the previous week.

In other first-round women's matches, wild card Lauren Davis upset No. 34 Klara Zakopalova, 7-6 (3), 7-6 (1), while 25th-ranked Simona Halep rallied to defeat Su-Wei Hsieh 6-7 (5), 6-1, 6-2.

In early first-round men's action, American Mardy Fish lost to 26th-ranked Philipp Kohlschreiber 7-5, 6-2.

American Brian Baker - in his first match since suffering a right knee injury in the first round of the Australian Open - pulled off 7-5, 6-3 upset of No. 63 Denis Istomin.

Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.