Williams vs Williams

DOHA, Qatar – The Williams sisters are heading for another title matchup, after Venus defeated Jelena Jankovic on Saturday and Caroline Wozniacki retired against Serena in the Sony Ericsson Championships semifinals.

Defending champion Venus advanced to her second straight Doha final after rallying for a 5-7, 6-3, 6-4 win. Wozniacki then had to quit with an apparent abdominal injury when trailing Serena 6-4, 0-1.

Wozniacki received medical treatment on her stomach muscles in the first set and decided to quit after breaking Williams to start the second. The 19-year-old Dane has been battling injuries all week, and said Friday that her aching abdominal muscles were affecting her serve.

After chasing down a drop shot and hitting a forehand winner for the break, Wozniacki pulled up and then told the chair umpire she couldn’t continue. She exchanged hugs and handshakes with Serena, explaining her decision with an apologetic smile.