Maria Sharapova has won a 31/2-hour marathon to earn a semifinal berth at the Sony Ericsson Open. Sharapova rallied to beat No. 26-seeded Alexandra Dulgheru 3-6, 7-6 (6), 7-6 (5) in a match that ended at 12:19 a.m. Sharapova's opponent Thursday will be No. 21 Andrea Petkovic, who reached the semifinals with her second upset in two days, beating No. More...