Charleston: Top-ranked Caroline Wozniacki needed to win two tiebreakers to advance at the Family Circle Cup on Thursday.
The top-seeded Dane defeated Barbora Zahlavova Strycova 7-6 (6), 7-6 (9) in a quarterfinal match that lasted more than 2½ hours. It looked nothing like the 56-minute easy victory Wozniacki enjoyed in Wednesday's opening match.
"I knew that it wasn't going to be easy. I've seen her before and played her last year here," Wozniacki said.