Sharapova overcomes 13 double-faults to beat Errani 7-5, 7-5 in Key Biscayne quarterfinals

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.