Serena Williams Semifinal Postponed

Serena Williams' US Open semifinal has been postponed until Friday because of rain in the forecast.

The USTA says both women's semifinals -- No. 1-seeded Williams against unseeded Roberta Vinci of Italy and No. 2 Simona Halep of Romania against No. 26 Flavia Pennetta of Italy -- are being rescheduled for Friday, starting at 11 a.m. ET with the Halep-Pennetta match.

The men's semifinals will be played afterward, beginning at 5 p.m. instead of the originally scheduled 3 p.m. In those matches, No. 1 Novak Djokovic meets defending champion Marin Cilic and No. 2 Roger Federer plays his Swiss Olympic and Davis Cup teammate Stan Wawrinka.