Ash Barty crashed out of the Adelaide International at her first hurdle after going down in straight sets to Danielle Collins.

It took only 65 minutes for American Collins to defeat the defending champion and world number one in a 6-3 6-4 triumph.

Barty, who had a bye in the first round, did have opportunities, breaking in the first game of the match and building a 4-1 lead in the second set.

But on both occasions Collins stormed back, claiming her first win in four attempts against home favourite Barty, who had beaten her in the semi-finals of last year's tournament.

Coco Gauff continued her fine run to reach a first WTA quarter-final since August 2020 with an impressive comeback win over sixth seed Petra Martic.

The American triumphed 5-7 6-3 6-4 in two hours and 12 minutes to book a clash with compatriot Shelby Rogers at the WTA 500 event.

Gauff did not relinquish serve once after losing the first set and did not even offer up a break-point chance in the decider, which she sealed with a pivotal early break secured with a passing winner.

"I go into every tournament thinking that I can win," said the 16-year-old.

"Obviously that's impossible, to have a perfect record, but I go into every tournament believing that I can win. 

"I try not to think far ahead in the match, at least I just try to focus on my next match, just because you have to get through that before you can get to the finals, and just take it one match at a time."

Second seed Belinda Bencic will face Storm Sanders in the quarter-finals after a 6-1 6-3 win over Misaki Doi.

In a match where she was not quite as dominant as the scoreline suggests, Bencic had to fend off 12 break points but was successful in saving 10 of them.

Number four seed Elise Mertens withdrew before her match with a shoulder injury, so Anastasija Sevastova beat lucky loser Christina McHale to set up a last-eight tie with Jil Teichmann.

Teen stars Iga Swiatek and Coco Gauff earned Adelaide International victories on Tuesday, but third seed Johanna Konta is out.

French Open champion Swiatek secured a 6-3 6-4 triumph over Madison Brengle to set up a last-16 tie against home favourite Maddison Inglis, who beat veteran Sam Stosur in a three-set epic.

"Inside I'm the same person, but I realise that everybody's kind of treating me differently," Swiatek said after the win, as she reflected on the attention she now receives as a grand slam champion.

"So it's something you have to adjust to, and also keep yourself down to earth and the same as you were.

"We did a great job last year and hopefully this season will also be successful. 

"Tennis-wise it also changes - I’m not an underdog anymore, so I start my matches with a different attitude, and that’s the kind of thing you have to learn to do.

"Madison is the kind of player who uses her opponent's power, so I had to stay cool. 

"I tried to calm myself down, stay low in the legs, and sometimes play longer rallies to get in the rhythm, because the first round is always tough at any tournament."

Gauff also progressed, saving eight of the 11 break points she faced to defeat Jasmine Paolini 6-4 6-7 (4-7) 6-2 in a match lasting over two-and-a-half hours.

A tough test against Petra Matric is up next for Gauff in the last 16 after the Croatian sixth seed recovered from a set down to win against qualifier Ludmilla Samsonova.

Gauff's fellow American Shelby Rogers is the first player to reach the quarter-finals.

Konta had a bye in the opening round and had no answers for Rogers as she played her first match of the WTA 500 tournament.

Rogers won 6-2 6-2 in just 76 minutes, never dropping serve in the contest.

Danielle Rose Collins will face world number one Ash Barty after beating Zheng Saisai at the WTA Adelaide International.

The American wrapped up a 7-6 (7-5) 6-1 victory and will now face top seed Barty, who will still be smarting from her surprise quarter-final exit at the Australian Open.

Barty is the reigning champion in Adelaide and will be seeking to put that loss to Karolina Muchova firmly behind her.

Collins' compatriot Shelby Rogers also prevailed, beating Veronika Kudermetova 6-3 7-6 (7-4) to set up a clash with third seed Johanna Konta.

Anastasija Sevastova overcame Caroline Garcia 6-2 6-4, while eighth seed Wang Qiang was a 6-4 6-3 winner over teenager Olivia Gadecki.

Serena Williams has withdrawn from her semi-final at the Yarra Valley Classic due to an injury to her right shoulder.

As a result, home favourite Ash Barty will progress to the final of the Australian Open warm-up event at Melbourne Park.

Williams, who is chasing an eighth Australian Open crown and an historic 24th grand slam singles success, had been in impressive form this week, demolishing Tsvetana Pironkova in straight sets.

Friday's quarter-final against American Danielle Collins proved a harder slog, as she was forced into a match tiebreak to win 6-2 4-6 10-6.

An anticipated showdown against Barty will now not come to pass, with the world number one to pursue a ninth career title against either Garbine Muguruza or Marketa Vondrousova.

"I think the rust is always there for everyone the first few matches of the season. But without a doubt, I felt better and better each match," Barty told reporters after being taken the distance by Shelby Rodgers.

"Each match has been very different, different challenges, different things I've had to overcome, which is the best thing, to be able to work through those and give myself another chance to play a little bit better the next day, focus on some new challenges for the next day."

Williams is due to face Germany's Laura Siegemund in the first round of the Australian Open on Monday.

Serena Williams roared into the quarter-finals of the Yarra Valley Classic with a 6-1 6-4 victory over Tsvetana Pironkova on a star-studded day of action in Australia.

The 23-time grand slam champion was in fine form at Melbourne Park, where the biggest names in women's tennis were competing across multiple tournaments, as she sealed a straight-sets triumph to continue her preparations for a shot at an eighth Australian Open title.

In doing so the 39-year-old extended her head-to-head record over the Bulgarian to 6-0 and was delighted to get the job done.

"It's definitely nice to get another win," the American said during her on-court interview.

"She's clearly a great player, so it wasn't easy, but it was good to come through."

Speaking at her media conference, Williams added: "Last time it was an incredible three-set match, so today I was like, 'All right, let's really try and focus and learn to do better than last time.'"

World number one Ash Barty had a less straightforward path to the last eight, requiring three sets to see off Marie Bouzkova.

The home hope ultimately prevailed 6-0 4-6 6-3, with second seed and reigning Australian Open champion Sofia Kenin also taken the distance in a 5-7 7-5 6-2 win over Jessica Pegula, as Nadia Podoroska dug deep to down Petra Kvitova 5-7 6-1 7-6 (9-7).

With Barty now set to face Shelby Rogers, Danielle Collins awaits Williams having impressively defeated third seed Karolina Pliskova 7-6 (7-5) 7-6 (7-3), while Garbine Muguruza overcame Anastasia Pavlyuchenkova 6-1 6-2 to set up a meeting with Kenin.

In the Gippsland Trophy, the top three seeds all dodged upsets, with two-time grand slam winner Simona Halep, 2019 Australian Open victor Naomi Osaka and 2018 Tour Finals champion Elina Svitolina safely navigating through the last 16.

Fifth-seeded Briton Johanna Konta failed to convert two match points as she succumbed to a 4-6 7-6 (12-10) 7-6 (7-4) defeat to Irina-Camelia Begu.

Meanwhile, at the Grampians Trophy there were wins for Anett Kontaveit, Jennifer Brady and Angelique Kerber.

World number one Ash Barty won her first WTA Tour match in almost a year at the Yarra Valley Classic, while Naomi Osaka got her Gippsland Trophy campaign going with a victory.

Barty sat out the vast majority of the 2020 season due to the coronavirus pandemic but marked her comeback with a 6-3 6-3 success over Ana Bogdan at Melbourne Park.

The Australian will face Marie Bouzkova next after the Czech defeated Aliona Bolsova on Tuesday.

Garbine Muguruza raced past Alison Van Uytvanck 6-2 6-0 and she was joined in the third round by Petra Kvitova, who battled to beat Venus Williams 7-6 (8-6) 7-5.

Reigning Australian Open champion Sofia Kenin, who was 7-5 up when Camila Giorgi retired from their match, is also through.

In her first match since winning the US Open in September, Osaka cruised to a 6-2 6-2 success against Alize Cornet and will meet Katie Boulter after the Briton came from a set down to beat Coco Gauff 3-6 7-5 6-2.

Iga Swiatek was also making her first appearance since winning a major title – the French Open last October – and after a slow start won 10 of the final 11 games to beat Kaja Juvan 2-6 6-2 6-1.

Aryna Sabalenka ended 2020 with back-to-back titles in Ostrava and Linz, before kicking off the new year with another trophy in Abu Dhabi. However, her run of 15 straight victories ended with a 1-6 6-2 1-6 loss to Kaia Kanepi.

Bianca Andreescu was due to gear up for the Australian Open by contesting the Grampians Trophy this week but withdrew from the competition to focus on training instead.

Aryna Sabalenka closed out the 2020 season by beating doubles partner Elise Mertens and clinching her third title of the year at the Linz Open.

Top seed Sabalenka triumphed 7-5 6-2 to finish the year with a ninth straight win and back-to-back trophies following her success two weeks ago in Ostrava, where she was also victorious in the doubles alongside Mertens.

The Belarusian took an hour and 42 minutes to overcome the second seed, moving her level with Simona Halep for the most WTA Tour titles in 2020.

Mertens had a chance to serve out the opening set after breaking Sabalenka for the second time at 4-4, but she failed to do so and dropped her next service game as the match turned on its head.

Sabalenka made it three straight breaks early in the second and she somehow hung into a rally before producing a powerful backhand to secure another piece of silverware.

"Hopefully there's many more titles to come for our team … it's a tough period and I really appreciated having the opportunity to play here," said Sabalenka.

"Everyone, thank you so much. It's been an amazing week and I'm really happy to finish the season with a title."

At a time when the world is drastically different from the norm, there is something rather comforting about the familiarity of Serena Williams remaining a global phenomenon.

While the coronavirus pandemic has had a significant impact on how we go about our normal lives, some things do not change and Williams' enduring quality is proof of that.

The American great has 23 grand slam singles titles, the most in the Open Era and one shy of Margaret Court's overall record.

It began, professionally, on this day a remarkable 23 years ago when Williams defeated Elena Likhovtseva at the Ameritech Cup Chicago for her first main-draw win on the WTA Tour.

At that same tournament, Williams went on to defeat stellar names Mary Pierce and Monica Seles before falling to the brilliant Lindsay Davenport in the semi-finals.

A stunning period of dominance has followed in two decades since and below we take a look at some of the best numbers behind a genuine legend.

73 - Williams has won 73 WTA singles titles so far. Her first was in Paris in 1999, with her most recent coming in Auckland in January 2020.

33 - The 37-year-old has reached an incredible 33 grand slam singles finals, losing just 10 of those.

5 - Williams has finished the year ranked as world number one five times, in 2002, 2009, 2013, 2014 and 2015.

39 - Including 14 in doubles and two in mixed doubles, Williams has won 39 major titles - the joint-third highest total since the Open Era began.

1 - Williams is the only player, male or female, to have completed a Golden Slam in both singles and doubles competitions. As well as triumphing at every slam and the Olympics as a singles competitor, Serena has achieved the same feat alongside sister Venus in doubles.

7 - Williams has seven titles at the Australian Open and Wimbledon, with six more at the US Open, and three at Roland Garros.

319 - Having spent 319 weeks as world number one, Williams is third behind Martina Navratilova (332) and Steffi Graf (377).

2 - She has held all four grand slam trophies on two occasions - in 2002-03 and 2014-15.

98 - In total, Williams has appeared in 98 singles finals on the WTA circuit.

186 - Williams spent 186 weeks as world number one between February 2013 and September 2016, equal with Graf's record from August 1987 to March 1991.

Coco Gauff defeated home favourite Katerina Siniakova in straight sets to advance to the second round of the Ostrava Open.

Teenager Gauff, who made the main draw after a pair of wins in qualifying, fought back from a break down three times in the opening set and went on to triumph 7-5 6-4.

A meeting with third seed Aryna Sabalenka is the next task for the American, who has won just two of her past seven matches on the WTA Tour.

Elena Rybakina has reached a Tour-leading five finals in 2020 but the eighth seed fell to a 6-2 3-6 6-3 defeat to the measured Daria Kasatkina.

Kasatkina played an intelligent, efficient match and had 15 winners to 14 unforced errors, while Rybakina had 35 to 49.

Veronika Kudermetova's 6-2 6-4 victory over Donna Vekic booked a second-round meeting with Karolina Pliskova, while there were also wins for Jennifer Brady and Ons Jabbeur.

Elena Rybakina will meet Elina Svitolina in her fifth WTA Tour final of 2020 at the Internationaux de Strasbourg.

The Kazakh beat Nao Hibino 6-3 6-4 in one hour and 16 minutes in the last four to reach her first final since the Tour resumed following the coronavirus pandemic.

No one has been to more WTA finals in 2020 than Rybakina, though she has only won one of her previous four - the Hobart International in January.

Hibino had knocked out Sloane Stephens and Jelena Ostapenko to reach her maiden clay-court semi-final, but this proved a step too far for the unseeded Japanese.

Svitolina made her second final of 2020 with a 6-2 4-6 6-4 triumph over Aryna Sabalenka in the other last-four meeting.

Sabalenka had completed her rain-delayed quarter-final over Katerina Siniakova across three sets earlier in the day, and that may have taken its toll in a match against Svitolina that lasted almost two hours. 

Elina Svitolina progressed to the semi-finals of the Internationaux de Strasbourg but will have to wait until Friday to find out her opponent after rain suspended play between Aryna Sabalenka and Katerina Siniakova.

Number two seed Svitolina was made to work hard for her 6-4 6-3 victory over Jil Teichmann, battling back from a break down in both sets.

The world number five took an hour and 23 minutes to secure her first semi-final for six months.

"It was a great fight from Jil and I think both of us were playing at a really good level at some points," Svitolina said.

"I was fighting. I didn't start the match very well, but I was trying to be very focused and fight back. In the end, I'm very happy with how I handled the match."

Sabalenka and Siniakova will resume their contest on Friday after the latter claimed the first set 6-2. Play was suspended due to rain with the Czech 2-1 down in the second but serving next.

The other semi-final will be contested by fifth seed Elena Rybakina, who defeated Zhang Shuai 6-3 6-2, and Nao Hibino, who ousted 2017 French Open champion Jelena Ostapenko 7-6 (7-2) 7-6 (7-4).

Aryna Sabalenka avoided an upset by fighting back to defeat Anna Blinkova 1-6 6-4 6-2 and reach the Internationaux de Strasbourg quarter-finals.

The world number 12, this year's champion in Doha, made the last-eight stage for the first time since the WTA returned after the coronavirus shutdown having won just three matches before this week.

Katerina Siniakova awaits after the Czech upset the odds to defeat seventh seed Ekaterina Alexandrova 6-2 6-4.

Alexandrova defeated Siniakova when winning her first WTA singles title in Shenzhen this season but was unable to repeat the feat.

"I feel really good on clay," Siniakova said. "It was tough, it was a good match, I'm happy about it."

Nao Hibino defeated Zarina Diyas in straight sets, while third seed Kiki Bertens withdrew injured when trailing 4-2 in the decided set of her clash with Jelena Ostapenko.

Elina Svitolina battled past Magda Linette to reach the quarter-finals of the Internationaux de Strasbourg on Tuesday.

The second seed won the first set via a tie-break and came back from a double break down in the second to seal a 7-6 (7-0) 7-5 victory in an hour and 58 minutes.

Linette was just two points away from winning the opener and missed an opportunity to force a decider on set point in the second.

"It definitely was not easy. She was fighting back, she was trying to produce a good level; I was up and down," said Svitolina, who reached the quarter-finals on her return to the WTA Tour at the Internazionali d'Italia last week.

"It's not easy to come from another tournament with different balls, different conditions. I was trying just to fight and, in the end, I was lucky I finished in two sets."

Jil Teichmann awaits Svitolina in the last eight following a 7-6 (7-3) 7-5 win against 2018 champion Anastasia Pavlyuchenkova, while there were also victories for Elena Rybakina and Zhang Shuai.

Aryna Sabalenka revealed her decision not to take on Dieter Kindlmann as a coach after she cruised to a straight-sets win over Ellen Perez at the Internationaux de Strasbourg.

Number four seed Sabalenka was in fine form as she made a convincing start to her campaign, taking just over an hour to beat qualifier Perez 6-4 6-3 and move into the second round.

Perez was last year's doubles champion in Strasbourg but was no match for the world number 12, who is currently operating with her hitting partner as a coach.

Sabalenka had been working with Kindlmann, who used to coach her doubles partner Elise Mertens, heading into the US Open, but the Belarusian elected not to keep him on.

"I told him that I think I'm not ready for a new person on my team," Sabalenka explained.

"He's a great guy, great coach, but I'm just not ready. I'm going to work with my hitting partner for now as my coach."

Anna Blinkova, who beat Myrtille Georges 6-1 6-2, awaits Sabalenka in round two.

Former US Open champion Sloane Stephens succumbed to the shock result of the day, meanwhile, as she crashed out to world number 83 Nao Hibino. 

Stephens was going up against an opponent who was 0-3 across her first three events since the season was restarted, but Hibino secured a hard-fought 6-2 3-6 6-1 triumph.

"Last week, I lost in qualies in Rome and it was not a good match, so I learned from that," Hibino said after the match. "Of course, Sloane is a good player, especially on clay courts. I prepared mentally and with tactics, so I think it helped a lot today."

It was a bad day for Stephens' compatriot Christina McHale, who went down 6-7 (4-7) 7-5 7-6 (7-3) to Zarina Diyas.

Magda Linette beat Pauline Parmentier to set up a tie with second seed Elina Svitolina, while third seed Kiki Bertens will meet Jelena Ostapenko.

There were also victories for Elena Rybakina, Ekaterina Alexandrova, Alize Cornet, Shuai Zhang and Katerina Siniakova.

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