Stuttgart: Top-ranked Caroline Wozniacki reeled off 10 straight games to rally for a 6-4, 6-1 victory over Andrea Petkovic on Thursday and a place in the semifinals of the Porsche Grand Prix.
Wozniacki was 4-1 down and one point away from falling 5-1 behind but broke Petkovic's serve to cut the deficit. She also saved four break points in the next game to come to within 4-3.
Petkovic could not hold serve in the next game either and the No. 1 from Denmark rolled on.