Aryna Sabalenka will not play at Indian Wells after announcing she has tested positive for coronavirus.

In an Instagram Story post, the world number two revealed she feels "okay" while isolating after her COVID-19 result, though is "really sad" not to be playing in the tournament this year.

Sabalenka had been due to return to action for the first time since losing at the semi-final stage of the US Open last month.

"Unfortunately, I've tested positive at Indian Wells and won’t be able to compete," the Belarusian posted on Sunday.

"I've started my isolation and I’ll be staying here until I’m cleared by the doctors and health officials. So far I'm feeling okay but really sad to not be able to play this year."

The absence of Sabalenka is a further blow for the event, considering world number one Ash Barty had already pulled out.

Naomi Osaka is another big-name absentee, along with Serena Williams, while the men's edition is minus Novak Djokovic after the five-time champion opted to withdraw.

Emma Raducanu will be involved, however, after the US Open champion accepted a wild card, while Kim Clijsters has done the same as she prepares to continue her comeback with a first appearance at Indian Wells in a decade.

Andy Murray is a wild-card entrant for the men's tournament, with the main draw beginning on Wednesday.

Emma Raducanu has been given a wildcard entry to the Indian Wells Open in her first tournament since winning the US Open.

The 18-year-old claimed a sensational triumph at Flushing Meadows earlier this month, becoming the first qualifier to take a major title.

Raducanu defeated fellow unseeded teenager Leylah Fernandez 6-4 6-3 in the final of only her second grand slam.

The Briton did not drop a set throughout her fairytale run and climbed from 150th in the WTA rankings to now sit 22nd.

And Raducanu's remarkable display has earned her the opportunity to enjoy further stateside success at Indian Wells, having missed the cut when the entry list was first announced during the US Open.

She still has an outside chance of making the WTA Finals in Guadalajara, with appearances planned at tournaments in Russia and Romania later in October.

Raducanu's hopes of another deep run at Indian Wells have been boosted by the absence of superstar pair Naomi Osaka and Ash Barty, who have both withdrawn from the event.

Wimbledon champion and world number one Ash Barty has withdrawn from this month's Indian Wells Open. 

The Australian has not played since her surprise third-round defeat to Shelby Rogers at the US Open last month. 

Barty follows four-time grand slam champion Naomi Osaka in pulling out of the California event, the final WTA 1000 tournament of the year. 

The 25-year-old had indicated after her defeat at Flushing Meadows that she planned to play at Indian Wells. 

Defending champion Bianca Andreescu heads a strong field, with world number two Aryna Sabalenka, Wimbledon finalist Karolina Pliskova, French Open champion Barbora Krejcikova, Olympic bronze medalist Elina Svitolina and last year's Australian Open champion Sofia Kenin all taking part. 

Three other previous winners – Simona Halep, Elena Vesnina and Victoria Azarenka – will also be present, along with teenager Leylah Fernandez, who reached the US Open final. 

Kim Clijsters saw her latest WTA Tour comeback ended by Hsieh Su-wei at the Chicago Fall Tennis Classic on Monday.

The four-time grand slam champion, playing in her first match of 2021, was defeated 6-3 5-7 6-3 in a contest lasting two hours and 18 minutes on Stadium Court.

Clijsters, who retired in 2012, made her return to the Tour last year, losing her three matches.

After knee surgery at the end of 2020 and having contracted COVID-19 this year, the 38-year-old at last made her first appearance of the season but was bested in a gruelling contest by Australian Open quarter-finalist Hsieh.

Speaking prior to her return in Chicago, Clijsters spoke of how she was drawing inspiration from Andy Murray, who continues on the ATP circuit despite two major hip surgeries.

"Seeing Andy Murray and the way he speaks about his comeback and everything, it's so motivating and it gives you a lot of energy too," she said. "To see him go through the things he's gone through and be open about the challenges of it and the belief that he has, I feel like it's something I can relate to."

Seeds Jessia Pagula, Danielle Collins and Veronika Kudermetova all progressed in Chicago on Monday, although home favourite Madison Keys had to retire from her match with Aliaksandra Sasnovich.

Naomi Osaka is going to play tennis again and expects to feed her itch to return to the tour "soon".

Osaka said in the wake of her shock US Open third-round defeat to teenager Leylah Fernandez that she would take a break from the sport.

"I honestly don't know when I'm going to play my next tennis match. I think I'm going to take a break from playing for a while," Osaka told her post-match media conference following that loss.

She subsequently pulled out of Indian Wells but the four-time grand slam champion, who withdrew from the French Open back in May to protect her mental health, does not anticipate her absence being an extended one.

"I know I'm gonna play again, probably soon because I kind of have that itch again," Osaka told HBO's 'The Shop'.

"But it wouldn't really matter to me if I won or lost. I'd just have the joy of being back on the court.

"Just to, like, you know, that I'm doing it for myself."

Explaining her unhappiness on the court, Osaka added: "I started to feel like that power was being taken away from me.

"And the way that I felt, like, I wasn't playing to make myself happy and I was more concerned about … what would people say about me.

"I used to love the competition and just being competitive. Like if I were to play a long match, the longer it was the more fun it was for me.

"And then I just started to feel – recently – the longer it was the more stressed out I became. But I just needed a break to go within myself."

Anett Kontaveit sealed a second title of the season as she overcame Maria Sakkari in straight sets at the Ostrava Open.

The unseeded Estonian, who is ranked 30th in the world, saw off fourth seed Sakkari 6-2 7-5 to claim the trophy in the Czech Republic.

Kontaveit has now won two tournaments in four weeks, having won in Cleveland last month to end a four-year wait since winning her first title in 2017.

This was Sakkari's first final in over two years as well, but Kontaveit cruised past the Greek in just over an hour and a half as she did not drop a set all week.

That flawless level of tennis saw her eliminate Petra Kvitova, Paula Badosa and Belinda Bencic en route to the final, where the 25-year-old faced only one break point as she powered to a comfortable victory over a player who reached semi-finals at the French Open and US Open this year.

Sakkari managed more of a fight in the second set, where she battled for her sole break point, but Kontaveit breezed past any pressure and kept her serve to maintain control.

Sakkari, who is likely to move into the top 10 despite losing, had boasted a 5-3 head-to-head record in main-draw clashes between the pair coming into Sunday's final, but 23 unforced errors outnumbered the 20 winners from her racket as Kontaveit collected her most notable title to date.

Anett Kontaveit beat Olympic champion Belinda Bencic and will face home favourite Petra Kvitova for a place in the Ostrava Open final.

Estonian Kontaveit, ranked 30th in the world, claimed her fourth top-20 win of the season as she prevailed 6-4 6-3 on Friday.

Kontaveit also defeated Bencic in the 2020 Australian Open, meaning she is 2-0 in their head-to-head rivalry.

Czech left-hander Kvitova awaits in the last four, after the second seed defeated Bencic's Swiss compatriot Jil Teichmann 6-4 6-4.

Teichmann beat Kvitova in their only previous meeting, but the world number 10 had too much on this occasion, along with the backing of the crowd to boot as she chases a 29th singles title of her career.

The other semi-final will see top seed Iga Swiatek face Maria Sakkari.

Last year's French Open winner Swiatek reached her first semi-final since May – when she landed the prestigious title in Rome – by overcoming Elena Rybakina 7-6 (7-5) 6-2.

Sakkari, meanwhile, ended Tereza Martincova's hopes in straight sets.

Greek star Sakkari ended Swiatek's reign as Roland Garros champion in June, beating the Polish 20-year-old in the quarter-finals in Paris.

US Open champion Emma Raducanu has split from coach Andrew Richardson and wants to partner with someone with greater WTA Tour experience. 

Richardson had coached Raducanu in her younger days at Bromley Tennis Centre and accompanied the 18-year-old for her campaign at Flushing Meadows. 

The experience proved unforgettable as the Briton, ranked 150 in the world at the time and having played in just one other major previously (Wimbledon in July), took the title after moving through qualifying and the main draw without dropping a set. 

She became the youngest grand slam finalist since Maria Sharapova won Wimbledon as a 17-year-old in 2004 and is the only qualifier in tennis history to win a major final. 

Her astonishing triumph catapulted her to 22 in the WTA rankings and Raducanu is now looking for someone to guide her through the next phase of her career. 

Speaking at a homecoming event organised by the Lawn Tennis Association, she said: "Where I was at after Wimbledon, I was ranked around 200 in the world and at the time I thought Andrew would be a great coach to trial, so we went to the States but never did I even dream of winning the US Open and having the run I did, and now I'm ranked 22 in the world, which is pretty crazy to me. 

"I feel like at this stage in my career, and playing the top players in the world, I realised I really need someone right now that has had that WTA Tour experience at the high levels, which means that I'm looking for someone who has been at that level and knows what it takes. 

"And especially right now because I'm so new to it, I really need someone to guide me who has already been through that. 

"Obviously having such an experience with your team, it's tough to have that conversation with anyone, but I think for me, it's just really what I need." 

It has been suggested Raducanu could look to partner with Darren Cahill, the renowned coach who split with Simona Halep this month. 

For now, she is considering when to make a competitive return to action, with the notable Indian Wells Open coming up. 

"I'll decide in the next few days where I'm going to go to but, wherever I play next, I'm going to make sure I'm ready. I don't want to jump into things too early," she said. 

Olympic gold medallist Belinda Bencic eased to a straight-sets win over Sara Sorribes Tormo to maintain her good form and book a place in the Ostrava Open quarter-finals.

Third seed Bencic needed just 88 minutes to see off her 36th-ranked opponent as she made it 15 victories from her past 18 matches.

Czech wildcard Tereza Martincova is also through to the last eight on home soil after battling past French Open finalist Anastasia Pavlyuchenkova 7-6 (7-5) 7-6 (8-6).

Martincova is into her fifth quarter-final of the season and will take on number four seed Maria Sakkari, who saw off Jelena Ostapenko 6-4 6-2 earlier on Thursday.

Also through to round three is Elena Rybakina following a hard-fought 6-3 2-6 6-1 win over qualifier Magda Linette, while Jil Teichmann – who shocked former world number one Angelique Kerber in the previous round – advanced in three sets against Alison Riske.

She will face Petra Kvitova for a place in the semi-finals. 

Former world number one Naomi Osaka unsurprisingly withdrew from next month's Indian Wells Masters, having flagged a break from tennis following her US Open meltdown.

The tournament confirmed 2018 champion Osaka's absence on Wednesday, with the Indian Wells Masters scheduled to take place from October 4-17 after the 2020 edition was cancelled due to the coronavirus pandemic.

Osaka's US Open title defence came crashing down in a remarkable 5-7 7-6 (7-2) 6-4 third-round capitulation at the hands of eventual finalist Leylah Fernandez earlier this month.

Up a set and serving for the match at 6-5 on Arthur Ashe Stadium, four-time major champion Osaka lost her cool and composure after throwing her racquet three times in an unsuccessful second-set tie-break.

Amid boos in New York, Japanese star Osaka was also warned after hitting a ball into the crowd at Flushing Meadows.

After the surprise exit, Osaka told reporters she planned to "take a break from playing for a while."

She added: "I feel like for me recently, like, when I win I don't feel happy. I feel more like a relief. And then when I lose, I feel very sad. I don't think that's normal. I didn't really want to cry.

"I feel like… this is very hard to articulate. I feel like I'm kind of at this point where I'm trying to figure out what I want to do, and I honestly don't know when I'm going to play my next tennis match [tearing up]. Sorry."

It comes following a difficult couple of months due to mental health concerns as a result of "long bouts of depression" since winning the 2018 US Open.

Osaka withdrew from May's French Open having won her first-round match, after she was fined and threatened with further punishment – and possible expulsion from the grand slam – for skipping obligatory media duties.

She subsequently pulled out of Wimbledon before returning for the Olympic Games, though she suffered a surprise loss on home soil in Tokyo and was reduced to tears during a news conference in Cincinnati.

Iga Swiatek coasted through to the quarter-finals of the Ostrava Open after defeating Yulia Putintseva as Paula Badosa faltered against Anett Kontaveit.

Favourite Swiatek provided an astute performance to ease past Putintseva 6-4 6-4 to secure a potential quarter-final tie with Elena Rybakina.

Petra Kvitova, who is second seed in Croatia, did not enjoy as comfortable a victory but battled past Anastasia Potapova 6-1 6-7 (4-7) 6-3 to confirm her last-eight berth.

The ninth ranked Badosa, however, was not as fortunate as she was dumped out by Kontaveit, who cruised to a 6-3 6-4 win over the world number 27 in just over an hour.

Jelena Ostapenko set up a last-16 clash with fourth seed Maria Sakkari as she defeated Anna Blinkova 6-4 6-0, while Alison Riske recovered from a second-set setback to defeat Fiona Ferro 6-4 1-6 6-4.

Riske will now meet Jil Teichmann, who shocked former world number one Angelique Kerber, and whoever wins will be rewarded with a tie against world number 10 Kvitova.

Simona Halep has confirmed she has parted company with her long-time coach Darren Cahill.

Halep, who was the year-end number one in 2017 and 2018, has been coached by Cahill for the past six years.

She won the 2018 French Open, her first grand slam title, under his guidance before Cahill left the team for a spell to spend more time with his family.

Cahill – who also guided Halep to the 2018 Australian Open final – returned to coach the Romanian ahead of the 2019 WTA Finals, following on from her success at Wimbledon.

The 29-year-old has endured an injury-hit 2021 and was knocked out of the US Open in the fourth round by Elina Svitolina.

In a post on her official Twitter account, Halep announced: "After six wonderful years working together, Darren Cahill and I have decided that it's time to end our working relationship.

"Thank you D for everything, for making me a better tennis player and a better person."

Former world number one Angelique Kerber was stunned by Jil Teichmann as she lost 6-2 6-3 in Tuesday's Ostrava Open first-round tie.

World number 42 Teichmann raced to a memorable victory against the three-time grand slam winner in just over an hour as the left-hand collected her sixth win against a top-20 player this season.

Half of those wins have come this year as well, with the Swiss beating Naomi Osaka, Belinda Bencic and Karolina Pliskova in a breakthrough Cincinnati campaign.

Fifth seed Anastasia Pavlyuchenkova cruised through after negotiating a difficult first set against Ana Konjuh to win 7-6 (7-3) 6-1 in just over an hour-and-a-half.

Tereza Martincova's victory over fellow Czech Katerina Siniakova did not come as easily, though, with the former edging to a 5-7 6-4 7-6 (9-7) win in more than a three-hour slog.

Martincova, who is ranked 61st in the world, miraculously recovered from 5-0 down in the tie-break to save a match point before securing her first main-draw win in Croatia.

Yulia Putintseva experienced similar difficulties against Shuai Zhang, as she also battled out in a three-hour marathon and saved a match point to eventually succeed 5-7 7-6 (9-7) 6-4.

Paula Badosa got her campaign off to a winning start as the Ostrava Open began on Monday. 

Iga Swiatek, Petra Kvitova, Belinda Bencic and Maria Sakkari are among the top names at the WTA 500 event, though they are all yet to begin their campaigns. 

World number 27 Badosa was the only seed in action, and she started her week in smooth fashion with a 6-2 6-2 triumph over Russian qualifier Varvara Gracheva. 

In a dominant performance, Badosa did not even concede a break point as she triumphed in 73 minutes to gain some revenge for her defeat to Gracheva at the US Open earlier this month. 

Fellow Spaniard Sara Sorribes Tormo joined Badosa in claiming a first-round victory, though she had to work much harder to see off Anastasia Zakharova. 

While Sorribes Tormo triumphed 6-3 6-3, she was given a stern examination by Zakharova, who forced nine break points in the contest but paid the price for converting just two. 

The prize for Sorribes Tormos is a testing last-16 tie against Olympic gold medallist Bencic. 

Caroline Garcia, meanwhile, was a day one casualty as she lost in straight sets to Anastasia Potapova. 

Potapova will now take on two-time Wimbledon champion Kvitova, who will be playing in front of her home fans in the Czech Republic. 

Jasmine Paolini battled to a straight-sets victory over Alison Riske in Sunday's Portoroz final to win her maiden WTA singles title.

World number 87 Paolini had already eliminated three seeded players to reach her first final and she recovered from a slow start to see off another 7-6 (7-4) 6-2.

Third seed Riske led 5-2 in the first set after breaking her opponent's serve three times in the opening seven games, but Paolini dug deep and took four games on the spin.

The Italian used that momentum in the tie-break to open up a 5-2 advantage before getting over the line with her second set point.

After a gruelling 63-minute opening set, Paolini found the second a more straightforward affair as she broke for 3-2 and reeled off the remaining games, the last of those points coming via an error-forcing forehand.

Paolini, who won two-thirds of her second-service points and converted six of her 10 break points, is glad her hard work has paid off with a first singles success at the age of 25.

"It's been an amazing week here in Portoroz," she said in her on-court interview. "I feel just very happy, it's a big achievement for me, to win my first title. It's special to do it on the hard court.

"It wasn't easy to go through to the final. I'm proud of myself because I never gave up.

"I'm working really hard in the past couple of months. I understood more about my game, I think. I just want to keep this level for all the season that is almost finished, and to stay strong and keep this level."