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.
Melanie Oudin of the United States has been awarded a Wimbledon wild card after reaching the final of the grass-court Aegon Classic.
Melanie Oudin was introduced to the world - and to the notion of outsized expectations - when she was an unseeded and unknown 17-year-old from Marietta, Ga., who upset Maria Sharapova during a captivating run to the 2009 U.S. Open quarterfinals.
Spain's Anabel Medina Garrigues defeated qualifier Melanie Oudin 6-4, 4-6, 6-0 on Monday as the main draw action got underway at the WTA Tour's Charleston tournament.
Leander Paes and Radek Stepanek laboured their way to the pre-quarterfinals of the Miami Masters after downing Marcos Baghdatis and Sam Querrey.
Top-ranked Novak Djokovic of Serbia and Victoria Azarenka of Belarus will try to defend their titles at the $9.6 million ATP and WTA Miami hardcourt event that begins on Tuesday.
Venus Williams, John McEnroe and Melanie Oudin will be featured among five live broadcasts of World TeamTennis matches. Serena Williams also is scheduled to play this summer.
Defending champion Francesca Schiavone bounced back to her winning ways at the French Open, beating Melanie Oudin of the United States 6-2, 6-0 Monday in the first round.
Novak Djokovic did it again on Sunday, defeating world number one Rafael Nadal 4-6, 6-3, 7-6 (7/4) to win the ATP Miami Masters crown and remain unbeaten in 2011.