Serena Williams' decision to begin winding down her tennis career has saddened world number one Iga Swiatek and Belinda Bencic, who defeated the 40-year-old on Wednesday.

Williams announced on Tuesday that she is about to retire, saying "the countdown has begun" as she looks to "move in a different direction".

While the 23-time singles grand slam champion did not put a specific timeline on her remaining days in tennis, her comment about looking for new challenges after "these next few weeks" suggests the US Open – which she has already been included on the entry list for and starts at the end of August – will be her swansong.

That announcement came on the back of Williams' first singles win in 430 days, a defeat of Nuria Parrizas-Diaz at the Canadian Open in Toronto, but she was subsequently eliminated by Bencic on Wednesday, when the reality of her farewell tour set in.

Williams failed to hold back the tears as she said goodbye to the Toronto crowd for the last time as a player, and Bencic herself could not help feeling a little overcome

She said: "It was definitely very special. I think it was more than just the usual tennis match, also just really exciting, and also a little bit overwhelming for me, of course.

"[It's] great, I can be part of her career and her story and this was just really nice and I'm just really appreciative and honoured to play her so many times, and also here in Toronto.

"I mean, she's really the greatest of all time, so it's really exciting. I could have been on the court against her so many times and even today I really enjoyed it a lot. It was sometimes like a pinch me moment again."

Williams finished five different calendar years as the highest-ranked player in the world, a record only Steffi Graf and Martina Navratilova can better.

Swiatek, the current world number one, looks to be the best-placed of the next generation to challenge that achievement, though she recognises a degree of fortune in not having to face Williams at the peak of her powers.

"Well it's always pretty sad when you see such a career coming to an end, but on the other hand she's a legend and I feel like she's done so much," Swiatek added.

"It's really amazing. I'm pretty sad that I wasn't able to play against her and experience that her being the strongest one on tour, but on the other hand, I would be losing against her if I played [her at] that time, so that's fine!

"But she's a legend and everything that she has done on court and off court, she's basically a superstar and the way she handled playing tennis and business and also being a mother, it's mind-blowing. So I'm pretty sure that she's going to have a great second part of her career."

The Serena Williams' farewell tour in Toronto is over after she was knocked out of the Canadian Open 6-2 6-4 by 12th seed Belinda Bencic on Wednesday.

Williams, playing for the first time since declaring on Tuesday her intention to retire after this month's US Open, was no match for Tokyo Olympics gold medalist Bencic.

The 23-time major winner was unable to claim back-to-back WTA singles wins for the first time since last year's French Open, having defeated Nuria Parrizas-Diaz for her first victory in 430 days on Monday.

Bencic triumphed in one hour and 17 minutes, winning 84.2 per cent of first-serve points and converted five of eight break points throughout the match.

Williams' power was on show with 13 winners, but Bencic was physically more capable and decisively managed 25 winners with only 13 unforced errors.

Elsewhere, 2019 US Open winner and local hope Bianca Andreescu edged Alize Cornet in a see-sawing clash in the evening, winning 6-3 4-6 6-3 in two hours and 26 minutes.

Fourth seed Paula Badosa and fifth seed Ons Jabeur, who was last month's Wimbledon runner-up, were forced to retire due to injury.

Spanish 24-year-old Badosa withdrew against Yulia Putintseva 7-5 1-0 due to muscle cramping, while Zheng Qinwen had a walkover against Jabeur 6-1 2-1 due to abdominal pain.

Top seed Iga Swiatek brushed aside Ajla Tomljanovic 6-1 6-2 in 64 minutes. The win means Swiatek is the first player to win 15 WTA 1000 matches in straight sets in a row since 2009.

Canadian 13th seed Leylah Fernandez also bowed out, going down 7-6 (7-4) 6-1 to Brazil's Beatriz Haddad Maia, who will face Swiatek in the third round.

Second seed Anett Kontaveit lost 6-4 6-4 to Jil Teichmann in one hour and 27 minutes. Teichmann will next face Simona Halep who won in 71 minutes against Zhang Shuai 6-4 6-2.

Sixth seed Aryna Sabalenka got past Sara Sorribes Tormo 6-4 6-3 to set up a third-round meeting with Coco Gauff after she defeated Wimbledon champion Elena Rybakina 6-4 6-7 (8-10) 7-6 (7-3) in an epic that lasted two hours and 49 minutes.

Jessica Pegula won 6-2 7-5 over American qualifier Asia Muhammad to progress through to face Camila Giorgi after she knocked off Elise Mertens 7-3 7-5.

Third seed Maria Sakkari triumphed in three sets 6-2 4-6 6-2 over Sloane Stephens and will face Karolina Pliskova next after the Czech beat Amanda Anisimova 6-1 6-1.

Eighth seed Garbine Muguruza won 6-4 6-4 against Kaia Kanepi and Alison Riske toppled 16th seed Jelena Ostapenko 7-6 (7-2) 0-6 7-5.

The day after declaring her impending retirement, Serena Williams was full of emotion and admitted it had been a "pretty interesting 24 hours" for her.

Williams revealed on Tuesday in an article in Vogue that "the countdown has begun" for her retirement with this month's US Open set to be the 23-time major winner's last tournament.

The 40-year-old was knocked out of the Canadian Open on Wednesday by Belinda Bencic 6-2 6-4 and spoke after the match for the first time publicly since declaring her intention to retire.

"It was a lot of emotions obviously," Williams said during the on-court post-match interview.

"I've loved playing here [Toronto], I've always loved playing here. I wish I could have played better but Belinda played so well today.

"It's been a pretty interesting 24 hours."

Williams, who won the first of her 23 Grand Slam titles way back in 1999 at the US Open, was emotional about the reception from fans to her announcement.

"It's just been so memorable," Williams said.

"Like I said in my article, I'm terrible at goodbyes. But goodbye, Toronto."

Williams has already been named on the entry list for the US Open, which starts at Flushing Meadows at the end of August.

The former world number one had claimed her first WTA singles win in 430 days on Monday when she defeated Nuria Parrizas-Diaz in preparation for her US Open farewell.

Petra Martic beat home favourite Belinda Bencic to set up a semi-final against Caroline Garcia at the Ladies Open Lausanne.

Martic toppled the second seed with a 6-3 7-6 (7-2) victory on Friday.

The unseeded Croatian, who was beaten by eventual champion Elena Rybakina in the fourth round at Wimbledon last week, claimed the only break of the first set to lead 5-3 and held her nerve to serve it out. 

Bencic twice came from a break down in the second set to force a tie-break, but Martic raced into a 6-0 lead and duly moved into the last four.

The 31-year-old Split native will come up against Garcia, who beat Sara Sorribes Tormo 6-4 6-1.

Frenchwoman Garcia also reached the last 16 in the grass-court grand slam at SW19 and has won 11 of her past 12 matches.

Unseeded duo Olga Danilovic and Anastasia Potapova will contest the other semi-final following victories over Simona Waltert and Wimbledon quarter-finalist Jule Niemeier respectively.

At the Budapest Grand Prix, Anna Bondar is through to the last four without dropping a set in her homeland after defeating Martina Trevisan 6-4 6-1.

Ninth seed Bondar will face Bernarda Pera, who beat Elisabetta Cocciaretto 6-4 6-3. Yulia Putintseva had won all eight games before Lesia Tsurenko retired from their quarter-final due to injury and she will take on Aleksandra Krunic, who cruised past Wang Xiyu 6-0 6-1.

Top seed Danielle Collins suffered a shock defeat in a marathon first-round match with Simona Waltert at the Ladies Open Lausanne.

Collins, ranked a career-high seventh in the world, lost to a player 147 places below her as home hope Waltert prevailed in a final set tie-break.

The American battled back from a break down three times in the final set and had three match points in the tie-break.

But Collins could not find the telling blow as Waltert improbably turned the tide to win five successive points, and claim her first top-10 win 6-7 (5-7) 6-3 7-6 (8-6) after three hours and one minute of play.

Meanwhile, Waltert's compatriot Belinda Bencic survived a scare to avoid joining Collins on the casualty list, recovering from a set down to beat Diane Parry 3-6 6-3 6-1.

World number 77 Parry has claimed notable recent scalps in former French Open champion Barbora Krejcikova at Roland Garros and Kaia Kanepi at Wimbledon, but was denied another as the second seed hit back to advance. 

But there was no joy for fifth seed Nuria Parrizas-Diaz, who suffered defeat to Petra Martic, while eighth seed Varvara Gracheva lost to qualifier Eva Lys.

However, third seed Irina-Camelia Begu overcame Tamara Korpatsch in straight sets and sixth seed Caroline Garcia - fresh off a fourth-round run at Wimbledon - defeated Jasmine Paolini 6-3 6-3.

At the Hungarian Grand Prix, second seed Martina Trevisan came from a set down to survive against Natalia Szabanin and third seed Yulia Putintseva and ninth seed Anna Bondar also prevailed.

Ons Jabeur won the Berlin Open to seal her third career title following Belinda Bencic's retirement in the second set.

The win sees Jabeur rise to a career-high of number three in the world as the Tunisian – who was winning  6-3 2-1 when Bencic succumbed to an ankle injury – capitalised on her top seed position for the tournament.

With Jabeur on serve to clinch the first set, Bencic rolled her ankle and required treatment in a three-minute medical timeout – with Jabeur swiftly nosing herself ahead on the restart with an ace.

Olympic gold medallist Bencic pushed to continue but came to the net to retire when trailing 2-1 in the second set, taking Jabeur's tally of wins in 2022 to 30, a total that is only bettered by world number one Iga Swiatek.

Victory marked Jabeur's second title of 2022, with the 27-year-old having previously won the Madrid Open.

Jabeur had plenty of support from the crowd throughout the tournament, and said: "I cannot forget how amazing the crowd is, Tunisians are amazing, thank you for coming. I hope I can come back next year, it's been great to come back to Berlin."

Bencic paid tribute to her opponent following the game, saying: "You deserve this title, I really don't want to take this moment away from you because I think you played incredible tennis.

"This is the best tennis of your life, so I hope you continue. You gave me a really hard time, maybe it was one serve too much for me. This is your moment so I want you to enjoy it and focus on your title."

Jabeur continues her Wimbledon preparations at Eastbourne next week, competing in both the singles and doubles event – she will play alongside Serena Williams – while Bencic will be hoping to recover in time to feature in the season's third grand slam.

Ons Jabeur kept Coco Gauff waiting for a top 10 debut as the Tunisian battled past her teenage opponent to reach the Berlin Open final.

Gauff would have secured a career-high ranking on the WTA list if she had won Saturday's semi-final, but top seed Jabeur took it 7-6 (7-4) 6-2 to earn a shot at Belinda Bencic in the title match.

Only world number one Iga Swiatek has won more matches on the WTA Tour than fourth-ranked Jabeur this year, who collected a 29th win as she overcame a 3-1 career head-to-head deficit against Gauff to earn the victory.

Gauff, at 18 years and 98 days, would have become the youngest American to reach a grass-court singles final on tour since Andrea Jaeger was runner-up to Martina Navratilova at Wimbledon in 1983.

It was not to be her day though, Jabeur breaking serve for the fourth time in the match to seal victory, encouraged by a large and vocal Tunisian following.

Reflecting on the match, Jabeur said: "When you play Coco you have to have all the shots. She's a talented player; she's very tough to beat. You can see I've lost already three times against her.

"Sometimes she takes it, sometimes I take it, and it was a great match for both of us."

This is just the second WTA tournament where 27-year-old Jabeur has been a top seed.

"I've tried to act like a number one seed on and off the court, and it's a good pressure," she added. "I'm trying to handle it very well and with the support of our Tunisian people here it's great."

Olympic gold medallist Bencic had earlier claimed an impressive 6-7 (6-8) 6-4 6-4 win over Greek second seed Maria Sakkari in the first semi-final.

Jabeur was bettered by Bencic in a hard-fought Charleston final in April, but is determined to secure a different outcome this time.

"I'm definitely going for the final revenge because we played each other at Charleston, and it was a very, very tough match," Jabeur said. "I hope she's tired from today's match."

Rain meant there was no play at the Birmingham Classic on Saturday, with the semi-finals set back to Sunday.

Beatriz Haddad Maia will face 2019 Wimbledon champion Simona Halep, while Zhang Shuai tackles Sorana Cirstea.

Coco Gauff reached the first grass-court semi-final of her career by beating Karolina Pliskova at the Berlin Open, teeing up a clash with top seed Ons Jabeur.

Having already recorded her best tour-level run on grass by reaching the final eight, Gauff recorded a superb 7-5 6-4 win over two-time grand slam finalist Pliskova.

Gauff – who reached her first grand slam final at Roland Garros last month, saved four set points in the opener before roaring to victory in one hour and 37 minutes, and was delighted to have overcome a tough opponent in the world number seven.

"I'm super happy with how I played today," Gauff said on court after the win. "Playing her on grass, with her serve, how flat she hits the ball, it was really tough to be honest. 

"A first semi-final on grass is pretty cool, and also I feel like the opponents I've played this week haven’t been easy, especially today, so I'm proud of myself about that."

Gauff will face Jabeur for a spot in the final after the Tunisian fought back from one set down in a 6-7 (3-7) 6-2 6-2 win over Aliaksandra Sasnovich, who entered the contest having won 26 matches during an impressive year.

The other semi-final will see Maria Sakkari face Belinda Bencic, after the world number six cruised to a 6-0 6-3 win over Daria Kasatkina and Bencic beat Veronika Kudermetova 3-6 6-3 6-3.

In the Birmingham Classic, meanwhile, Simona Halep raced to a 6-4 6-1 win over Katie Boulter to reach the final four, but third seed Camila Giorgi fell to a 6-3 6-2 loss to Brazil's Beatriz Haddad Maia, who has now won eight consecutive games on grass.

While that pair will face off in one of Saturday's semi-finals, eighth seed Zhang Shuai will face Sorana Cirstea in the other. Zhang overcame Dayana Yastremska 7-5 6-4 and sixth seed Cirstea beat Donna Vekic 5-7 6-3 6-4.

Ons Jabeur held off qualifier Alycia Parks to reach the quarter-finals of the Berlin Open, saving set point before winning a competitive second-set tie-break to set up a last-eight clash with Aliaksandra Sasnovich.

Jabeur took one hour and 31 minutes to overcome her stubborn opponent in the German capital, with the world number four triumphing 6-2 7-6 (10-8) to reach her eighth quarter-final of 2022 – each of which have been at WTA 500 level or higher.

The Tunisian will face Sasnovich for a semi-final spot next time out, with the Belarusian having won 26 matches so far this year (including qualifying draws). Only Iga Swiatek (42) and Beatriz Haddad Maia (29) have more victories so far this season on the WTA Tour.

The other seeds in action in Berlin on Thursday also progressed, with Coco Gauff overcoming Wang Xinyu 6-0 6-4 to tee up a clash with Karolina Pliskova, and Belinda Bencic downing Anna Kalinskaya 6-4 1-6 6-1.

Defending champion Ludmilla Samsonova, however, suffered a 6-3 6-7 (5-7) 6-1 defeat to Veronika Kudermetova.

Meanwhile, the Birmingham Classic's top seed Jelena Ostapenko fell to a surprise 3-6 7-5 7-5 last-16 reverse against Ukraine's Dayana Yastremska, who reached her first ever grass-court quarter-final on the WTA tour.

The world number 79 will face Zhang Shuai for a spot in the final four after she fought her way to a 6-2 2-6 7-5 win over Elena-Gabriela Ruse.

Third seed Camila Giorgi will join them in the last eight after recovering from losing her first set against American Lauren Davis to secure a 3-6 7-5 6-2 win.

Top seed Maria Sakkari was eliminated from the Nottingham Open at the quarter-final stage by world number 48 Beatriz Haddad Maia on Friday.

Haddad Maia made it three career wins out of three against Sakkari with a 6-4 4-6 6-3 victory to reach her first WTA semi-final on grass.

The Brazilian will now take on Tereza Martincova, who beat last year's runner-up Zhang Shuai 6-3 6-2, for a place in Sunday's final.

Sixth seed Alison Riske is also through to the last four after recovering from a set down to beat home favourite Harriet Dart 4-6 6-2 6-1.

Riske's sixth career semi-final on grass will come against Viktorija Golubic, who surprised Ajla Tomljanovic 6-3 7-6 (8-6) in the final match of the day.

At The Rosmalen Grass Court Championships, second seed Belinda Bencic's participation was ended with a straight-sets defeat to Veronika Kudermetova.

French Open quarter-finalist Kudermetova prevailed 6-4 6-2 in 87 minutes to snap a three-match losing streak against Bencic.

Russian compatriot Ekaterina Alexandrova is up next in the semi-finals after easing past American qualifier Caty McNally 6-0 6-1

Top seed Aryna Sabalenka is into her third semi-final in her past five tournaments, meanwhile, thanks to a 6-2 3-6 7-6 (7-5) win over Alison Van Uytvanck.

Shelby Rogers, a 3-6 6-1 6-4 winner against Kirsten Flipkens, awaits Sabalenka in Saturday's semi-final.

Elena Rybakina and Tamara Zidansek were both surprise second-round losers at The Rosmalen Grass Court Championships as numerous top seeds fell on Thursday.

Third favourite Rybakina struggled to find her rhythm and fell to a 6-2 6-4 loss against world number 42 Shelby Rogers.

The American will face Kirsten Flipkens in the quarter-finals in the Netherlands after she eased past Ann Li in straight sets.

Aryna Sabalenka, the favourite at the tournament, had little difficulty in negotiating past Arianne Hartono 6-2 6-3 and she will meet Alison van Uytvanck in the next round.

The Belgian picked up the scalp of compatriot Elise Mertens, the eighth seed, with a 6-2 6-3 win over the world number 29.

Fourth seed Zidansek was another to fall as she suffered a 6-1 6-1 loss to Catherine McNally, while Veronika Kudermetova profited from Anna Blinkova retiring with the match heading for one set each.

Belinda Bencic, the second favourite, will next challenge Kudermetova after she bucked the trend of the day with a battling 7-6 (7-2) 6-4 win over Anna Kalinskaya.

Seventh seed Ekaterina Alexandrova had no trouble in advancing, meanwhile, as she saw off Anhelina Kalinina 6-4 6-2.

Maria Sakkari found herself 1-0 down against world number 109 Rebecca Marino before rain stopped play at the Nottingham Open, but the top seed responded to claim a 1-6 6-3 6-3 win.

Third seed Camila Giorgi had no such luck against Hannah Dart as she was eliminated 5-7 6-4 7-6 (7-3), while Alison Riske and Ajla Tomljanovic beat Caroline Garcia and Katie Boulter respectively in straight sets.

Iga Swiatek and Paula Badosa progressed to the third round of the Internazionali d'Italia with ease as the former continued her impressive winning run on Wednesday.

Top seed Switaek, seeking a fifth consecutive title, breezed past Elena-Gabriela Ruse 6-3 6-0 as she became the first female player to win 24 consecutive matches since Serena Williams in 2015.

Badosa followed suit by dispatching Aliaksandra Sasnovich 6-2 6-1 in just an hour and 17 minutes, teeing up a third-round clash with Daria Kasatkina, who beat Leylah Fernandez 4-6 6-3 7-6 (7-2).

Aryna Sabalenka, the third favourite in Italy, also made light work of Zhang Shuai to triumph 6-2 6-0, while fourth seed Maria Sakkari cruised past Madrid Open semi-finalist Ekaterina Alexandrova 6-3 6-2.

Sakkari will next face a Rome rematch with Coco Gauff, who defeated compatriot Madison Brengle 6-2 6-4. Teenager Gauff's sole win against Sakkari came at this tournament in the second round last year.

Yulia Putintseva came from behind to beat Garbine Muguruza 3-7 7-6 (7-4) 6-1, and will next meet Ons Jabeur, who made it eight successive main-draw wins by defeating Ajla Tomljanovic 7-5 6-2.

Seventh seed Danielle Collins also battled past former world number one Simona Halep 7-6 (7-1) 6-3.

There was no such joy for fifth seed Anett Kontaveit as she crashed out to Petra Martic in straight sets, while Jil Teichmann upset former Rome champion Karolina Pliskova in a three-set thriller.

Belinda Bencic, who was ranked as 12th seed, was another early casualty as she fell to a 7-6 (7-4) 6-1 defeat against American Amanda Anisimova.

Meanwhile, Jessica Pegula secured her third-round spot after Anhelina Kalinina withdrew due to injury, with Victoria Azarenka earning a straightforward 6-2 6-4 victory over Camila Osorio to get a shot at favourite Swiatek in the next round.

Ons Jabuer avenged her recent loss to Belinda Bencic with a win at the Madrid Open, while Coco Gauff is out after being beaten in straight sets in the round of 16 by Simona Halep on Monday.

Gauff joins other big names in exiting the WTA 1000 event, with Naomi Osaka, Garbine Muguruza, Danielle Collins, Paula Badosa and Maria Sakkari among those crashing out in the second round.

The number 14 seed did not put up much resistance against her Romanian opponent, with Halep winning 6-4 6-4 in just 77 minutes.

Gauff struggled on her own serve in particular, making six double faults and only winning 61.5 per cent of her first-serve points, compared to 83.8 from Halep on hers.

The former world number one and two-time Madrid champion will now face the only remaining top-eight seed in the tournament in the quarter-final, Jabeur, who defeated Bencic 6-2 3-6 6-2.

The Tunisian was out for revenge after losing to Bencic at the same stage last year, as well as in the Charleston Open final last month, and took it well as she sealed victory in just over two hours.

"I came here to take my revenge," Jabeur said after the win. "I wish I played like that in the final in Charleston, to be honest.

"Part of me is very proud of myself for coming today and getting the win. Belinda is such an amazing player and it's very tough to play against her. I'm very happy with the level I showed today, and hopefully this level will continue for the rest of the tournament."

Elsewhere, Victoria Azarenka is out after the number 15 seed was beaten 6-1 6-4 by Amanda Anisimova, who will now face Ekaterina Alexandrova in the last eight after she overcame Marie Bouzkova 6-7 (4-7) 6-0 7-5.

Simona Halep blew Paula Badosa away with a Madrid Open masterclass to reach the round of 16 on Saturday.

Second seed Badosa had no answer to the brilliance of Halep in her homeland as the relentless Romanian won 6-3 6-1 at the Caja Magica.

Unseeded two-time grand slam champion Halep took just an hour and 17 minutes to eliminate Badosa, breaking three times in the first set and twice in the second.

Halep, in a new era with Patrick Mouratoglou in her corner, won 84 per cent of points when she landed her first serve in, staying in the hunt to win this tournament for a third time with the French Open on the horizon.

The former world number one will face Coco Gauff for a place in the quarter-finals following the American's 6-1 2-6 6-4 late-night defeat of Yulia Putintseva.

Gauff, the 14th seed, racked up 10 double faults and was pushed all the way by Putintseva, but served out the match after securing a third break in a tight final set.

Ons Jabeur earlier advanced into the third round at the expense of Varvara Gracheva, recovering from a second-set bagel to win 7-5 0-6 6-4.

Jabeur faces a meeting with Belinda Bencic after the Swiss dispatched Karolina Muchova 6-3 4-6 7-5.

Victoria Azarenka came from a set down to beat Tamara Zidansek 3-6 6-1 6-3 to set up a meeting with Amanda Anisimova, who also had to come from behind to dispatch Petra Martic 3-6 6-3 6-2.

Ekaterina Alexandrova and Marie Bouzkova also progressed in the Spanish capital.

Belinda Bencic continued her strong run of form in the United States as she defeated world number 10 Ons Jabeur 6-1 5-7 6-4 to win the Charleston Open.

Sunday's success made it 10 victories from her past 11 matches for Bencic, with the lone defeat coming in a semi-final against Naomi Osaka at the Miami Open.

The Swiss Olympic gold medallist flew out of the gates in the opening set, winning 80 per cent of her points on serve (16 of 20) and breaking Jabeur twice.

It was a far more competitive second set as Jabeur's return game improved, the Tunisian also saving six of eight break points to force a decider.

Bencic prevailed in a rollercoaster of a third set, where Jabeur converted two breaks of serve, but the eventual champion managed three, finding a response every time she was challenged.

Jabeur becomes the second top-10 scalp claimed by Bencic this tournament after also defeating world number three Paula Badosa in three sets in the quarter-finals.