Maria Sharapova rallied to earn a spot in the semifinals of the Madrid Open on Friday, a few hours after defending champion Serena Williams withdrew from her match because of injury. Sharapova, who lost to Williams in last year's final, beat Li Na 2-6, 7-6 (5), 6-3 on clay at the Magic Box. Errors then began creeping into the Australian Open champion's game as Sharapova evened the match. After an exchange of breaks in the third set, Sharapova broke again and then held serve to win on Li's 43rd unforced error. More...