A calm Sloane Stephens picked her shots to perfection to overcome Japan's Naomi Osaka in a battle between the last two US Open champions at the WTA Finals on Monday before top seed Angelique Kerber was upset by Kiki Bertens.
Serena Williams shook off the rust and a feisty challenge from Serbia's Ana Ivanovic to open the defence of her WTA Tour Finals title with a 6-4, 6-4 victory in the opening match of the elite eight-player tournament on Monday.
Romania's Simona Halep kicked off her campaign for a maiden WTA Finals title in emphatic fashion with a thumping 6-0, 6-3 victory over US Open champion Flavia Pennetta in the opening match of the eight-woman season-ending tournament on Sunday.
The International Tennis Federation (ITF) named Novak Djokovic and Aryna Sabalenka as its 'world champions' of 2023 after their performances at this year's Grand Slams.
Serena Williams clinched the year-end World No 1 ranking for the fourth time without hitting a ball on Friday after Maria Sharapova, the only woman with any chance of overtaking her, was eliminated from the WTA Finals.
Factbox on Belarus' Aryna Sabalenka, who beat China's Zheng Qinwen in the Australian Open final on Saturday
Three contenders for the women's singles title at the Australian Open.
The five top contenders for the women's title at the Australian Open, which starts on Monday.
Making their first appearance in the WTA Finals in Singapore, Sania Mirza and Cara Black outplayed Raquel Kops-Jones and Abigail Spears in their opening match to book their semi-finals berth on Thursday.
World number one Carlos Alcaraz faces a potential quarter-final clash with old foe Jannik Sinner in his US Open title defence, and American Coco Gauff is on a collision course with defending champion Iga Swiatek on the women's side.
Czech-born Navratilova, who became a US citizen in 1981, was also diagnosed and beat breast cancer back in 2010.
India's greatest women's tennis player won six Grand Slam doubles titles and will compete in her final major this month at the Australian Open, where she bagged the women's doubles crown in 2016.
Hurkacz, Swiatek win as Poland march into United Cup final
World No 8 Muchova withdraws from Aus Open with wrist injury
Former World No 1 Ana Ivanovic brushed aside Caroline Wozniacki to win the Pan Pacific Open in Tokyo on Sunday and move closer to sealing a berth for the season-ending WTA finals in Singapore.
World number one Carlos Alcaraz retired injured against Holger Rune at the Paris Masters on Friday, sending his fellow 19-year-old through to the semi-finals, while Novak Djokovic and Felix Auger-Aliassime also sealed places in the last four.
Poland's Agnieszka Radwanska secured the last remaining spot in the season-ending WTA Championships without hitting a ball after Marion Bartoli retired from her Kremlin Cup quarter-final with an illness on Friday.
China's Li Na will meet Serena Williams in the final of the WTA championships after beating Czech Petra Kvitova 6-4, 6-2 on Saturday, becoming the highest-ranked player ever from an Asian country.
WTA Finals winner Garcia says she struggled with bulimia
The women's Grand Slams were all won by different players for a fifth straight year in 2021
Images from Day 3 of the US Open, at Flushing Meadows, New York.
Images from Day 2 of the 2023 US Open at Flushing Meadows in New York on Tuesday.
Halep, who won the French Open in 2018 and Wimbledon the following year, struggled for results last year due to injuries and reached only one WTA final, at the Transylvania Open, losing in her home tournament.
Images from Day 8 of the 2023 Australian Open at Melbourne Park on Sunday.
Muguruza wins all-Spanish clash with Badosa at WTA Finals
Andy Murray recovered from a slow start to beat Argentine qualifier Juan Ignacio Londero
Emma Raducanu's US Open victory is among the "greatest achievements" in women's sport, men's world number eight Dominic Thiem said.
Muguruza seals semi-final berth, Pliskova beats Krejcikova at WTA Finals.
* Swiatek started playing tennis in an attempt to emulate her older sister, who competed briefly on the junior circuit.
Canada's Bianca Andreescu has decided not to compete at the Tokyo Olympics due to the COVID-19 pandemic, the former US Open champion said.
World number one Novak Djokovic earned his 1,000th tour-level victory by beating Casper Ruud 6-4, 6-3 on Saturday to reach the Italian Open final.
Former champion Garbine Muguruza suffered a second consecutive first-round exit at the French Open
A round-up of all tennis action on Friday.
Images from Day 2 of the 2023 Australian Open at Melbourne Park on Tuesday.
Andy Murray took a step closer to a first title in arguably the toughest year of his playing career, grinding out a 3-6, 7-5 ,6-2 win over Ugo Humbert on Saturday to reach the final of the European Open in Antwerp.
Naomi Osaka has witnessed a huge change in her career after claiming a maiden Grand Slam title in 2018, but the rising star of women's tennis will not be changing her quirky personality in media appearances that has endeared her to so many.
The 27-year-old Romanian beat Sloane Stephens at Roland Garros to win her maiden Grand Slam title in June and will have spent 40 weeks at the top of the rankings by the end of the season.
Juan Martin Del Potro, who reached the quarter-final of the Australian Open on two occasions, has been battling problems with his right knee since June last year
"Unfortunately I am no longer able to train and play the way I used to, and recently my body can't live up to my expectations," Radwanska, 29, said in a post on Facebook.
Former world number one Garbine Muguruza was beaten 7-5, 6-4 by Aryna Sabalenka in the China Open second round on Tuesday while an ailing Jelena Ostapenko lost 6-0, 6-0 to Wang Qiang.