Second seed Patty Schnyder was beaten by fifth-seeded Svetlana Kuznetsova of Russia in the quarter-finals.
World number one Lindsay Davenport survived an error-strewn performance to beat Italian Silvia Farina Elia 7-5 7-5 on Sunday.
Top-seeded Nadia Petrova gave up just 13 points in the second set en route to a 6-4 6-0 triumph over Kaia Kanepi in the second round of the Amelia Island championship on Tuesday.
Russian Anastasia Myskina scraped past Israeli teenager Shahar Peer 6-2, 3-6, 6-3 to reach the third round of the Amelia Island Championship.
The second seed beat Mary Pierce of France 6-3, 6-1 at the Amelia Island WTA championship in Florida.
Former world number one Maria Sharapova won her second Pan Pacific Open title after Jelena Jankovic retired with a wrist injury in Saturday's final. It was Sharapova's first title since shoulder surgery last October and the 20th of her career. Her last tournament win came at Amelia Island in April 2008.
Russian fourth seed Elena Dementieva picked up her third title of the year and denied compatriot Maria Sharapova a comeback win with a 6-4, 6-3 victory in the final of the Toronto Cup Sunday.
Fourth seeded Dementieva advanced to her fourth final of the year with a clinical 7-6, 6-1 win over world number two Serena Williams. She will play Maria Sharapova, who scored a gritty 6-2, 4-6, 6-4 over Alisa Kleybanova.
Maria Sharapova captured her first claycourt title when she defeated Slovakia's Dominika Cibulkova 7-6, 6-3 in the final of the Amelia Island Championships on Sunday. Sharapova became the first woman to win three titles this season following her success at the Australian Open and Qatar Open and improved her 2008 win-loss record to 22-1.
Top seed Maria Sharapova reached the Amelia Island championships final after Lindsay Davenport withdrew due to illness on Saturday. Sharapova's opponent will be unseeded Slovakian Dominika Cibulkova, who reached her first WTA Tour final when she beat France's Alize Cornet 6-2, 2-6, 6-4.
Top-seeded Maria Sharapova advanced to the semi-finals of the Amelia Island championships after a 6-7, 6-3, 6-2 victory over Ukraine's Alona Bondarenko. The Australian Open champion will meet former world No 1 Lindsay Davenport. The American beat Hungary's Agnes Szavay 6-4 7-6, while Slovakia's Dominika Cibulkova will play Alize Cornet in the other semi-final. Cornet beat Virginie Razzano 6-4, 6-2 while Cibulkova beat France's Amelie Mauresmo 6-1, 7-6.
Lindsay Davenport was one of seven seeds to advance but four went out, including number three Daniela Hantuchova, fifth-seeded Patty Schnyder and Austrian Sybille Bammer, in the second round of the Amelia Island Championships.
The Indian had made the first round exit at the Tier I tournament at Key Biscayne in Miami last week.
Maria Sharapova took a marathon three hours, 27 minutes to beat Medina Garrigues 7-6, 5-7, 7-6 while Amelie Mauresmo overcame Agnieszka Radwanska 3-6, 7-5, 7-6 to make it to the quarter-finals of the Amelia Island Championships.
Second and third seeds Jelena Jankovic and Daniela Hantuchova were sent spinning from the Amelia Island tennis championship on Friday.
Tatiana Golovin stunned top seed Nadia Petrova 6-1, 6-2 in the final of the Amelia Island championships.
The French teenager will meet top seed Nadia Petrova.
Top seed Nadia Petrova made short work of China's Zheng Jie with a 6-2, 6-3 victory to move into the quarter-finals of the Amelia Island championship on Thursday.
Venus Williams continued her quest back to the top of women's tennis on Wednesday, upsetting fourth seed Patty Schnyder to reach the third round of the Amelia Island championship.
Greece's Eleni Daniilidou caused the biggest upset on the opening day of the Amelia Island championship when she cruised to a 6-0 6-4 victory over French 10th seed Marion Bartoli on Monday.
The Indo- South African pair shocked second seeds Virginia Ruano Pascual of\nSpain and American Meghann Shaughnessy in the semi-finals of the Bausch and Lomb Championships.
They beat Australia's Nicole Pratt and Bryanne Stewart 6-2, 6-3 in the quarter-finals of the Bausch and Lomb Championships.
This year's WTA championships pays the winner $1 million, equalling the largest prize in women's sport.
The Indo-Aussie combination were beaten 6-2, 6-4 by Alona Bondarenko and Anastasia Yakimova
Top seed Nadia Petrova fired five aces in securing her 22nd victory of the year at the Amelia Island tournament.
The Indo-South African pair beat Spain's Lino Dominguez and Medina Garrigues to make the grade at Amelia Island.
Despite spraining her left ankle on Friday, the former world No. 1 is hopeful of playing the first round tie against Belgium.
Elena Dementieva made a confident start to her claycourt campaign as she beat compatriot Alina Jidkova 6-4, 6-4
The world no. 1 will take on Farina Elia in the summit clash of the Amelia Island Championship.
The seventh seeded Russian beat the American ace in the quarter-finals of the Amelia Island championship.
The former world number one has indicated she intends, if picked for the team, to represent the U.S. at the Athens Olympics in August.
The 47-year-old legend will play at the French Open later this month.