Four-time runner-up Maria Sharapova has overcome an uneven performance at the Sony Open to reach the semifinals by beating Sara Errani 7-5, 7-5.
Sharapova had 57 unforced errors, including 13 double-faults, and had to erase three set points in the second set Wednesday.
The third-seeded Sharapova will play Thursday against the winner of the quarterfinal Wednesday night between No. 15-seeded Roberta Vinci and No. 22 Jelena Jankovic. Errani, seeded No. 8, fell to 0-26 against opponents ranked in the top five.
Sharapova completed a career Grand Slam last year but has never won Key Biscayne. She lost in the final in 2005, `06, `11 and `12.
She's bidding to become the third woman to win Indian Wells and Key Biscayne in the same year, joining Steffi Graf and Kim Clijsters.