Caroline Wozniacki squeaked by Mandy Minella 6-3, 7-6 (2) in the first round of the Luxembourg Open.
Caroline Wozniacki squeaked by Mandy Minella 6-3, 7-6 (2) in the first round of the Luxembourg Open.
Lintao Zhang/Getty Images

LUXEMBOURG (AP) -- Top-seeded Caroline Wozniacki struggled to a 6-3, 7-6 (2) win over local Mandy Minella to reach the second round of the Luxembourg Open on Tuesday.

Second-seeded Sloane Stephens of the United States had an easier time, defeating 2009 champion and Swiss wild card Timea Bacsinszky 6-3, 6-3.

Two seeds fell: No. 4 Kirsten Flipkens of Belgium lost to Katarzyna Piter of Poland 6-4, 6-2, and No. 6 Mona Barthel of Germany lost to Stefanie Voegele of Switzerland 1-6, 6-4, 7-6 (3).

Third-seeded Sabine Lisicki of Germany started slowly against Croatia's Donna Vekic before she recovered to win 2-6, 6-3, 6-0.

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 This material may not be published, broadcast, rewritten, or redistributed.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.