Top seed Venus Williams beat Flavia Pennetta while the Russian accounted for Eleni Daniilidou of Greece in Saturday's semi-finals.
An Australian Open official said Williams had withdrawn from the first Grand Slam of 2007 because of a left wrist injury.
Top seed Justine Henin of Belgium battled past two-times champion Venus Williams while fourth Russian Svetlana Kuznetsova beat compatriot Anna Chakvetadze in the semi-finals.
Wimbledon champion Venus Williams blasted past Alona Bondarenko of Ukraine 6-1 6-2 on Friday to charge into the fourth round of the U.S. Open.
The Russian beat Italy's Roberta Vinci 6-2, 7-6 in the Toronto Cup on Tuesday.
Venus Williams gave a supreme effort in the Fed Cup semi-final against Russia after coming off the high of winning her fourth Wimbledon title but came up short in Sunday's decisive doubles match in Stowe, Vermont.
Wimbledon champion Venus Williams beat Russian Nadia Petrova 7-6 0-6 6-4 in the second singles on Saturday to level the Fed Cup semi-final between the United States and Russia at 1-1.
As she did two years ago when she came in at number 14, the imposing American made a mockery of a low seeding.
The 27-year-old American beat France's Marion Bartoli 6-4, 6-1 in the final.
Marion Bartoli stunned top seed Justine Henin to reach the Wimbledon final on Friday, beating the world number one 1-6 7-5 6-1.
Ana Ivanovic will take on Venus Williams in the semi-finals.
In the semi-finals of the Luxembourg Championship the teenager will play Italian fifth seed Francesca Schiavone.
Williams surrendered her Wimbledon crown last July when she lost to the 22-year-old Serb in the third round.
Rain played spoilsport at the French Open for the second day running when a torrential downpour stopped the action for a second time on Monday.
The Swiss needs to win in Paris to join Don Budge and Rod Laver as the only men to hold all four slams at the same time.
The Russian won the Istanbul Cup after her opponent Aravane Rezai retired hurt.
Venus Williams became one of the oldest players to win a WTA title when she beat Caroline Wozniacki in the final of the Auckland Classic on Saturday.
Fourth-seeded Venus Williams outpowered Bulgarian Tatiana Poutchek 6-1 6-2 to move into the second round of the Istanbul Cup on Tuesday.
Jerome Barson, who was a passenger in a sedan that collided with the SUV that Venus Williams was driving, died 13 days after the accident.
Sister Venus, actress Eva Longoria; singer Ciara, singer Kelly Rowland, of Destiny's Child fame and wife of New York Knicks' star Carmelo Anthony, LaLa, were the group of girls who were part of the soiree that was held at a local diner in Florida.
The third seeded Russian rallied to beat the American to reach the semi-finals of the Warsaw Cup.
The world No 32 cited a left wrist injury as the reason for her withdrawal.
Unseeded Venus Williams marched into the Family Circle Cup semi-finals by beating Spain's Anabel Medina Garrigues 6-4 7-5 on Friday.
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.
Top seed Maria Sharapova dodged the showers on her way to a 6-3, 6-2 victory over Taiwan's Chan Yung-Jan to set up a third round encounter against Venus Williams at the Sony Ericsson Open on Saturday.
The three-times Wimbledon champion will partner Taylor Dent for the United States at the Dec. 29-Jan. 5 event in Perth's Burswood Dome.
The American has targeted a return to the world's top 16 by the French Open.
Top seed Amelie Mauresmo, Kim Clijsters and Martina Hingis also revelled in improved conditions following the rain-soaked start to the French Open.
The seventh-seeded American next plays top seed Shahar Peer of Israel at the Memphis International.
France's Alize Cornet beat a despondent Serena Williams 6-4, 6-4 in the semi-finals of the Dubai Championships on Friday in what the world number 26 described as the biggest win of her career.
The American continued her comeback from injury with a 6-4, 6-4 win over 16-year-old Dane Caroline Wozniacki.
The former world number one beat Japan's Akiko Morigami 6-1, 2-6, 6-4 in the first round of the Memphis International.
In an interview last month after a World Tennis Tour event at the Greenbrier in West Virginia, they said they had not yet decided whether they were finished competing. Playing almost exclusively with each other throughout their 25-year careers, the Bryans captured a professional era record 119 titles, including 16 Grand Slam wins, 39 ATP Masters 1000s and the ATP Finals title four times.
Champion Venus Williams was knocked out of the Family Circle Cup beaten 7-5, 6-4 by 17-year-old Tatiana Golovin of France.
Czech duo Andrea Hlavackova and Lucie Hradecka won the U.S. Open women's doubles title on Saturday with a 6-7(4), 6-1, 6-4 win over Australia's Ashleigh Barty and Casey Dellacqua.
She beat sixth seed Ana Ivanovic in the first round of the Luxembourg Championship on Wednesday.
