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Wozniacki , Stephens win openers at Luxembourg

AP - Sports
Wozniacki, Stephens in Luxembourg Open quarters
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Caroline Wozniacki of Denmark reacts to a point she won against Sloane Stephens of the U.S. during the China Open tennis tournament at the National Tennis Stadium in Beijing, China Thursday, Oct. 3, 2013. (AP Photo/Andy Wong)

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.

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