American tennis star Melanie Oudin was recently diagnosed with a type of arrhythmia or irregular heartbeat.

Williams won her sixth Miami crown and denied Sharapova her first Miami title, dropping the Russian to 0-5 in Miami finals. Williams has beaten Sharapova 11 times in a row and leads their overall rivalry 12-2.

Serena thrashed Agnieszka Radwanska 6-0, 6-3 in the second semifinal, and will meet Sharapova who beat Jelena Jankovic in an earlier clash.

Sharapova is trying to become just the third woman to win both the prestigious Indian Wells and Miami hardcourt titles in the same year. Steffi Graf accomplished the feat in 1994 and 1996, and Clijsters did so in 2005.

Li will play top seed Serena Williams in the quarter-finals after the American came back from a set down to win 2-6, 6-4, 6-2 against Slovakia's 13th seed Dominika Cibulkova.

Serena was down a service break trailing 4-1 in the second set on Monday before she won five straight games. She swept the final three games and served out the match at love with three aces.

Sharapova has never won the Miami title, although she's reached the final four times.

Seventh seeds Leander Paes and Michael Llodra, along with third seed Mahesh Bhupathi and Daniel Nestor had earlier booked berths in the second round.

Pennetta, ranked 103rd, will meet Williams on Thursday in a second-round match at the $8.5 million event, which awarded byes to all 32 seeded players in both the men's and women's draws.

US qualifier Melanie Oudin defeated former world number one Jelena Jankovic in straight sets to win her first WTA Tour title here on Monday.