Rome (AP): Maria Sharapova pulled out of Saturday's semifinal match at the Italian Open with a left calf injury.

The problem apparently developed while Sharapova was warming up for her match with defending champion Jelena Jankovic.

In Sunday's final, Jankovic will meet either sixth-seeded Anna Chakvetadze or French qualifier Alize Cornet, who were playing later.

Sharapova will still take over the No. 1 spot in the rankings Monday due to Justine Henin's retirement.

Withdrawals have been a common theme at the Foro Italico this year.

Both semifinals at the Rome Masters last week ended early due to players quitting, setting the tournament record with five retirements in all. On Friday, Serena Williams withdrew in the quarterfinals with a back problem.

Sharapova required 2 hours, 44 minutes to get by Patty Schnyder on Friday, a match that concluded near midnight local time.