AMELIA ISLAND, Florida (AFP) - Australian Open champion Maria Sharapova rallied to defeat Ukranian Alona Bondarenko 6-7 (9/11), 6-3, 6-2 in a Friday quarter-final at the WTA Bausch and Lomb Championship.

Top seed Sharapova advanced to a Saturday semi-final at the 600,000-dollar clay court event against the winner of a later match between US veteran Lindsay Davenport and Hungarian eighth seed Agnes Szavay.

The Russian beauty, who turns 21 on April 19, has never reached a clay court final in her career but would with a victory Saturday that would also give her a chance to play for the 95,500-dollar top prize.

Sharapova improved to 21-1 on the season despite squandering three set points in the opening-set tie-breaker, eventually surrendering the set by netting a forehand, her 27th unforced error.

"Considering a couple of those set points I had, it should have been over in two sets," Sharapova said. "I was really tentative when I had those set points. Somehow I scrambled my way out of it in the second. She looked like she was getting a little tired."

Bondarenko, who broke Sharapova in the second game of the match, could not the close the upset, however.

Sharapova smacked a forehand winner to claim the second set and broke Bondarenko in the third and fifth games of the final set on her way to a 5-1 lead before closing out the match with a service winner.

"I was pretty impressed with the way I mentally hung in there," Sharapova said. "I could easily have let it go in the second set with the way I let the first set get away."

Bondarenko dropped her only previous match against Sharapova in three sets last month at Indian Wells.

Sharapova skipped the previous event in Miami after complaining of fatigue following a semi-final loss at Indian Wells to Russian Svetlana Kuznetsova that ended an 18-match win streak.

Sharapova calls the clay surface her biggest challenge and said she is working as much to prepare for the French Open next month as she is to win another title.

"I would have loved to have finished this match off as quickly as I can. But I'm here to learn," Sharapova said. "I want to get as many matches in as I can before the French."

Davenport, 31, has won two titles in 2008 and enters the quarter-finals with a 20-4 record this year. She seeks her fourth Amelia Island crown after crowns in 1997, 2004 and 2005. She has a 33-5 record here with seven semi-final trips.

Szavay, ranked a career-best 15th, has never faced Sharapova before.

"Either one is going to be tough," Sharapova said. "I'm just glad I gave myself another opportunity."

French teen Alize Cornet, ranked 49th in the world, beat 27th-ranked compatriot Virginie Razzano 6-4, 6-2 in another quarter-final.

Cornet, 18, will next face the winner of Friday night's match between 2001 winner Amelie Mauresmo of France and Slovakia's Dominika Cibulkova.