Collated results of WTA Linz

Following are Thursday's collated results from the fourth day of the WTA Linz tournament in Linz, Austria , according to Xinhua.

Second round:

2-Sloane Stephens, United States, bt Andrea Petkovic, Germany, 7-6 (7-1), 4-6, 6-3

Stefanie Voegele, Switzerland, bt Karin Knapp, Italy, 4-6, 6-2, 7-5

7-Dominika Cibulkova, Slovakia, bt Katarzyna Piter, Poland, 6-0, 6-1

Patricia Mayr, Austria, bt Maryna Zanevska, Ukraine, 6-1, 6-7 ( 1-7), 6-4

1-Angelique Kerber, Germany, bt Alexandra Cadantu, Romania, 6-1, 6-0