Following are Thursday's results from the fourth day of the WTA Luxembourg Open, according to Xinhua.
Second round:
((prefix number denotes seeding))
1-Caroline Wozniacki, Denmark, bt Monica Niculescu, Romania, 6- 3, 6-2
4-Sabine Lisicki, Germany, bt Tereza Smitkova, Czech Republic, 6-4, 6-0
Karin Knapp, Italy, bt Andrea Petkovic, Germany, 7-5, 7-5
Stefanie Voegele, Switzerland, bt Karolina Pliskova, Czech Republic, 6-1, 3-6, 6-3
2-Sloane Stephens, United States, bt Yvonne Meusburger, Austria, 7-5, 6-4
