KEY BISCAYNE, Fla. — Serena Williams beat Maria Sharapova for the 15th consecutive time Thursday, rallying in both sets to win 6-4, 6-3 in the Sony Open semifinals.

KEY BISCAYNE, Fla. — Serena Williams beat Maria Sharapova for the 15th consecutive time Thursday, rallying in both sets to win 6-4, 6-3 in the Sony Open semifinals.

On the men's side, Rafael Nadal advanced to the semifinals by hitting a flurry of forehand winners down the stretch to beat Milos Raonic 4-6, 6-2, 6-4.

On Saturday, the No. 1-ranked Williams will try for a record seventh Key Biscayne title against No. 2 Li Na, who overcame 40 unforced errors to beat Dominika Cibulkova 7-5, 2-6, 6-3. Williams is 10-1 against Li.

Williams improved to 16-2 against Sharapova, whose most recent victory in their rivalry came in 2004.

The No. 1-ranked Nadal, who is 0-3 in Key Biscayne finals, needs one more win to get there again. His opponent Friday night will be No. 7-seeded Tomas Berdych, who advanced by beating No. 22 Alexandr Dolgopolov 6-4, 7-6 (3).

Nadal has beaten Berdych 16 times in a row over the past seven years.

Three-time champion Novak Djokovic will play in the other semifinal today against No. 20-seeded Kei Nishikori, who eliminated Roger Federer.

Williams first won Key Biscayne in 2002 and is the defending champion. A minority owner in the Miami Dolphins, she has worn the team's orange and turquoise throughout the tournament she considers her home event because she lives 90 minutes up Interstate 95.