The French top seed beat the American 4-6, 7-5, 6-4 in the final of the Antwerp Diamond Games.
Elena Rybakina set up a showdown with 2021 French Open champion Barbora Krejcikova for a place in Saturday's final.
Maria Sharapova defeated French qualifier Stephanie Foretz 6-1, 6-4 while Venus Williams survived British wildcard Naomi Cavaday.
Venus Williams gained revenge for her Wimbledon final defeat by Garbine Muguruza when the American advanced to the last four of the WTA Finals with a gutsy 7-5 6-4 victory over the Spanish world number two on Thursday.
Roger Federer was lucky to keep alive his dream of winning a maiden Roland Garros crown and Venus Williams used a good night's sleep to spare herself from a French Open nightmare in the second round on Thursday.
Ana Ivanovic claimed her first WTA Tour title in more than two years with a 6-2, 5-7, 6-4 victory over fellow former world number one Venus Williams to clinch the Auckland Classic on Saturday and boost her confidence ahead of the Australian Open.
Serena Williams remains on course for a record sixth win at the Sony Ericsson Open after beating sister Venus 6-4, 3-6, 6-3 to set up a final meeting with 19-year-old Belarusian Victoria Azarenka. Azarenka defeated Russian Svetlana Kuznetsova 6-3, 2-6, 7-5 in Thursday's other semi-final to book her place in a top tier final for the first time.
Venus Williams avoided another early exit with a routine win over fellow American Alison Riske at the Volvo Car Open in South Carolina while Swiss second seed Belinda Bencic was ousted by Russian qualifier Elena Vesnina.
Raonic advances, Sock ousted in Rogers Cup
The Williams sisters will in the United States' Fed Cup match against Belgium in April.
The three-time former champion entered her sixth Wimbledon final, beating Serbian teenager Ana Ivanovic.
Tennis stars Venus Williams and Tomas Berdych have posed naked for ESPN The Magazine's Body Issue.
Venus Williams beat Jill Craybas 6-3, 6-1 to book her spot in the Japan Open second round.
Top seed Venus Williams beat Flavia Pennetta while the Russian accounted for Eleni Daniilidou of Greece in Saturday's semi-finals.
IMAGES from the matches played at the Miami Open on Thursday
Venus Williams battled past fellow American Laura Granville 7-6, 6-4 to reach the Memphis International semi-finals
As she did two years ago when she came in at number 14, the imposing American made a mockery of a low seeding.
Spain's Carla Suarez Navarro came back from a dreadful first set to defeat Venus Williams.
Images from the third day at the US Open, the final Grand Slam tournament of the year, in New York, on Wednesday:
Top seed Serena Williams came from a set down to book her place in the Stanford Classic semi-finals with a hard-earned 2-6, 6-3, 7-5 win against fifth-seeded Serb Ana Ivanovic on Friday.
Images from all the action on Day 9 of the Australian Open at Melbourne Park on Tuesday
The seventh-seeded American next plays top seed Shahar Peer of Israel at the Memphis International.
Images from cation on day nine of the US Open being played at the Flushing Meadows.
The former world number one beat Japan's Akiko Morigami 6-1, 2-6, 6-4 in the first round of the Memphis International.
Venus Williams will make her Hopman Cup debut in Perth later this year, partnering John Isner to represent the United States in the mixed international tournament, organisers said on Wednesday.
Five-times champion and second seed Venus Williams was stunned 6-2, 6-3 by Bulgaria's Tsvetana Pironkova in the quarter-finals of Wimbledon on Tuesday.
A round-up of the fourth day's play at the French Open.
She beat sixth seed Ana Ivanovic in the first round of the Luxembourg Championship on Wednesday.
Aravane Rezai blasted her way to the biggest singles title of her career when she stunned fourth seed Venus Williams 6-2, 7-5 in the Madrid Open final on Sunday.
Venus Williams unleashed the fastest serve by a woman at a grand slam as the American kept the Stars and Stripes fluttering at the French Open on Wednesday.
China's Li Na defeated a battling Venus Williams 7-5, 3-6, 6-1 to reach the final of the Cincinnati Open on Saturday after an enthralling two-hour nine minutes encounter.
Venus Williams, battling a mystery bug and a dogged opponent who refused to lie down, advanced to the third round of the Family Circle Cup in Charleston on Wednesday.
The victory sent the Swiss through to the Italian Open final against 16th seed Dinara Safina.
Venus Williams beat Czech Lucie Safarova 6-1, 6-4 in the second round of the Italian Open
Serena Williams marked her first European appearance of the season with victory on the Madrid Open's striking blue clay courts on Monday, but her sister Venus crashed out in the second round.
Venus Williams earned her first victory of 2006 when she defeated Urszula Radwanska 6-3, 6-3 to reach the second round in Warsaw.
Less than a month after her run to the Wimbledon final, where she lost to Spain's Garbine Muguruza, 37-year-old Williams again had to turn back time against a young challenger.
Images from Day 1 of the Wimbledon Championships.
