Serbian top seed Ana Ivanovic pulled out of the Olympic Games on Sunday, dealing another blow to the injury and rain-plagued tournament.
The French Open champion, who had been due to face Ukraine’s Mariya Koryttseva in the first round, was suffering from an injured thumb.
Ivanovic, who will be deposed as world number one by compatriot Jelena Jankovic on Monday, is the latest big name to withdraw.
Maria Sharapova, Tatiana Golovin and Amelie Mauresmo had already pulled out of the competition while 1996 champion Lindsay Davenport has decided not to play in the singles.
Second seed Jankovic is still a doubtful starter after picking up a calf strain. She is due to play Zimbabwe's Cara Black in the first round.
Ivanovic's pull-out came on a rain-hit day at the tennis tournament where only nine of a scheduled 45 matches were completed.
