Serena Williams moved into the U.S. Open semifinals after rallying past Tsvetana Pironkova, 4-6, 6-3, 6-2 on Wednesday.
The 38-year-old Williams has now played three consecutive three-set matches.
Williams advanced Wednesday after quickly dropping the opening set. She then dropped serve early in the second set, but recovered to win the second set 6-3. In the third set Williams cruised, taking advantage of a fatigued Pironkova, who appeared to be wearing down physically as the match progressed.
For the match, Williams finished with 20 aces compared to just four from Pironkova. Williams in total won 98 points compared to 86 for Pironkova.