Belgian teenager Yanina Wickmayer has reached her first semifinals in a Grand Slam at the U.S. Open.
In a debut of unseeded Grand Slam quarterfinalists, Wickmayer rallied from 4-1 down in the second set to beat Kateryna Bondarenko 7-5, 6-4 in Arthur Ashe Stadium on Wednesday.

The 19-year-old Wickmayer, ranked 50th, blew a 5-3 lead in the first set and needed five set points to win it. Then she won the last five games, taking the match when 52nd-ranked Bondarenko, the first Ukrainian to reach the last eight in a Grand Slam, slapped a forehand into the net.

Wickmayer will meet another teenager in the semis, either 19-year-old Caroline Wozniacki of Denmark, or 17-year Melaine Oudin of the USA. Their match was scheduled for the night session Wednesday.

Wickmayer becomes the second Belgian in Friday's semifinals, joining Kim Clijsters. Clijsters will face defending champion Serena Williams.

She's also the second unseeded player to reach this year's semifinals, joining Clijsters, and the eighth in the Open era. The others were: Elena Dementieva (2000); Venus Williams (1997); Mima Jausovec (1976); Julie Heldman (1974); Helga Masthoff (1973); and Chris Evert (1971).

In a men's doubles semifinal Wednesday, Lukas Dlouhy of the Czech Republic and Leander Paes India, the No. 4 seeds, ousted top-seeded Americans Bob and Mike Bryan 6-4, 3-6, 7-6.

In a women's doubles quarterfinal, Cara Black of Zimbabwe and Liezel Huber of the USA, the top seeds, defeated sixth-seeded Nuria Llagostera Vives and Maria Jose Martinez Sanchez of Spain 6-3, 2-6, 7-5.