After a three-hour suspension, the two matches were halted once again by a brief rain around 7 p.m..

After the second restart of the match, Bacsinszky sealed her place in the semifinals for the second time in three years with a 6-4 victory in the second set. She finished a total of three aces and 25 winners, nine more than her French opponent.

"Probably the experience of being already twice in the quarter-finals and made it even to the semi-final once helped me a lot, especially today," said Bacsinszky.

Ostapenko, to be 20-year-old on Thursday, also seemed to benefit from the rain delay as she beat Wozniacki 6-2 in the decisive set.

"Maybe this one is one of the best ones (birthday gifts). To play in the semi-final of Roland Garros on your birthday, it's really nice," said Ostapenko.

Wozniacki admitted she had a difficult match.

"She goes for her shots. Her shots are hard to read, so you don't really feel comfortable at any point in the match.

"You think that she won't be able to do crosscourt or down the line in certain moments, but she does it anyway," commented Wozniacki.

Men's singles title favorites Rafael Nadal and Novak Djokovic had to wait one more day for setting up their highly anticipated clash in the semifinals as their quarter-final matches were later cancelled due to rain.

China's Zheng Saisai and her Romanian partner Irina-Camelia Begu also saw their doubles quarter-finals put off until Wednesday.

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