Australia's Sam Stosur fought back from a set down to claim the Japan Open for a second time on Sunday and deny Canadian teenager Eugenie Bouchard her first WTA title.
German Kerber has not won a title since and will now drop out of the world's top 10.
The second seeded Russian will play her doubles partner Anna-Lena Groenefeld, in the Family Circle Cup.
Here are eight women to watch during the US Open which starts on Monday.
Jabeur advances to first WTA 100 final in Madrid in style.
Fritz delivers as US win inaugural United Cup crown
Justine Henin remained on course for a successful defence of her WTA Championships crown when she secured her place in the final with a spectacular win over Ana Ivanovic.
Her last Grand Slam triumph came in 2017 and she has not won a WTA title since lifting the ASB Classic in Auckland at the start of the 2020 season.
Sania Mirza is one win away from making the main draw of the women's singles of WTA AEGON International tournament as she reached the final round of the qualifiers with a hard-fought win over Georgia's Anna Tatishvili, in Eastbourne.
Sania Mirza and her Russian partner Elena Vesnina rallied from a set down to score a hard-fought victory over the Czech combo of Andrea Hlavackova and Lucie Hradecka and enter the final of the WTA Indian Wells tournament. They will clash with the US pair of Liezel Huber and Lisa Raymond.
Former world number four and Australian Open runner-up Dominika Cibulkova announced her retirement on Tuesday.
One year after shaking off a crippling foot injury to claim a stunning US Open victory, Sloane Stephens said her follow-up season felt just as good as the American prepares to play in next week's WTA Finals for the first time.
Caroline Wozniacki breezed into the final of the Indian Wells WTA tournament with a commanding 6-2, 6-3 victory over her good friend Agnieszka Radwanska on Friday.
Djokovic says Peng situation horrifying, says tennis must unite.
Angelique Kerber produced a stunning display of defensive tennis to see off the big-hitting Naomi Osaka 6-4 5-7 6-4 in a classic Red Group encounter between the last two Grand Slam champions at the WTA Finals on Wednesday. The victory evens up Kerber's record at 1-1 in round robin play as Osaka slumped to her second straight defeat at the season ending event, leaving the U.S. Open champion on the brink of elimination from the eight-woman tournament.
Kim Clijsters captured the Rogers Cup with a 7-5, 6-1 victory over fellow Belgian Justine Henin-Hardenne.
In the semi-finals, Clijsters beat defending champion Svetlana Kuznetsova while Douchevina accounted for Roberta Vinci.
Sania Mirza and Edina Gallovits stunned fourth seeds Anna Smith and Zi Yan in straight sets to progress to the doubles semi-finals of the Guangzhou International Women's Open in Guangzhou, China.
Simona Halep was able to shake off the disappointment of a third consecutive early exit from the WTA Finals by focusing on a positive year that led to the 26-year-old old Romanian climbing to the top of the world rankings.
He will skip the two Masters series events in Shanghai and Paris next month.
Elena Vesnina survived a battle of attrition and nerves to beat fellow Russian Svetlana Kuznetsova 6-7(6), 7-5, 6-4 in the BNP Paribas Open final on Sunday and secure the biggest title of her career.
Pablo Carreno Busta rallied from a set down to defeat Hubert Hurkacz 3-6, 6-3, 6-3 in Montreal to claim the biggest title of his career at the Canadian Masters on Sunday.
Holder Venus Williams completed her circuitous route to the WTA Championships final, beating Serbia's Jelena Jankovic 5-7, 6-3, 6-4 on Saturday to set up yet another showdown with sister Serena. Serena, who will end the year as world number one for the first time since 2002, got past Caroline Wozniacki after the Dane pulled out with a stomach injury when trailing 6-4, 0-1.
"I feel like I'm more... I wouldn't say confident but I'm more, like, I have inner peace. I don't know. Like zen. I don't really want to use words I don't know.'
Williams had signalled her intention to retire in a Vogue article in early August, saying she was "evolving away from tennis" but never confirming the U.S. Open as her final event.
Venus Williams will play Vera Zvonareva in the final of the WTA Championships after both women achieved difficult three-set victories on Saturday. Wimbledon champion Williams overcame Serbian world number one Jelena Jankovic 6-2, 2-6, 6-3, and Zvonareva beat fellow-Russian Elena Dementieva 7-6, 3-6, 6-3.
Indian tennis ace Sania Mirza advanced to the quarter-finals of the Family Circle Cup WTA tournament in Charleston, US, with a straight-set victory over Sabine Lisicki of Germany.
India's Rohan Bopanna and Ramkumar Ramanathan registered a resounding straight-set win to cruise into the doubles semi-finals but it was the end of the road for compatriot Sania Mirza and her Ukrainian partner Nadiia Kichenok, in Adelaide, on Friday.
Sania Mirza said she has no regrets leaving the sport as she is 'not the one to compete when I know I can no longer do it'.
Factbox on Australia's Ashleigh Barty, who beat Czech Republic's Marketa Vondrousova 6-1 6-3 in the French Open final on Saturday:
Jelena Ostapenko enjoyed a winning end to her season with a 6-3, 6-1 triumph over Karolina Pliskova in her final White Group match at the WTA Finals on Thursday and vowed to return as a better player after her first taste of the event.
They were beaten by the top-seeded pair of Maria Elena Camerin and Gisela Dulko.
Asked after the Wimbledon final about the War in Ukraine, Rybakina replied that her English was not good enough to speak about the issue.
Venus and Serena Williams kept up their semi-final date with commanding victories over Vera Zvonareva and Anastasia Rodionova respectively at the WTA Tier II Bangalore Open on Friday. Venus won 6-4, 6-3, while Serena was through at 6-1, 6-4.
Rafael Nadal toppled big-serving American Reilly Opelka to remain perfect on the year while unseeded Serbian Miomir Kecmanovic stunned world number six Matteo Berrettini.
Carlos Alcaraz downed Felix Auger-Aliassime 6-4, 6-4 to book an Indian Wells semi-final place
As Sania Mirza and Martina Hingis stand on the threshold of a unique milestone, former India players discuss the Hyderabadi's contribution in the all-conquering partnership with Bikash Mohapatra/Rediff.Com.
Fifth seed Serena Williams reached the Family Circle Cup final by beating French teenager Alize Cornet 7-5 6-3 on Saturday. The 26-year-old next faces ninth seed Vera Zvonareva, who upset fellow-Russian Elena Dementieva, the fourth seed, 6-3, 6-7, 6-3 in a wildly fluctuating semi-final.
Djokovic did not drop a set en route to the final in Rome