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Wozniacki, Stephens in Luxembourg Open quarters

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) -- Caroline Wozniacki, Sloane Stephens and Sabine Lisicki - the top three seeded players - won in straight sets Thursday to reach the Luxembourg Open quarterfinals.

Wozniacki beat two-time finalist Monica Niculescu of Romania 6-3, 6-2. Stephens, seeded second, defeated Yvonne Meusburger of Austria 7-5, 6-4. Lisicki of Germany eliminated Tereza Smitkova of the Czech Republic 6-4, 6-0.

Stephens, an American ranked 12th, has yet to lose a set in Luxembourg and will play Stefanie Voegele on Friday. The 54th-ranked Swiss struggled past Karolina Pliskova of the Czech Republic 6-1, 3-6, 6-3.

Also in the second round, Karin Knapp of Italy downed Andrea Petkovic of Germany 7-5, 7-5.

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