Jennifer Brady is the last player standing among those forced into a hard 14-day quarantine after arriving in Australia.
Australian Open 2021 Highlights: Novak Djokovic through to ninth final; Jennifer Brady sets up Naomi Osaka clash
Australian Open 2021 Semi finals: Novak Djokovic will look to stay on track for an 18th Grand Slam title, while Serena Williams has the formidable figure of Naomi Osaka blocking her path to a record-equalling 24th when the Australian Open semi-finals begin.
Australian Open 2021: Serena Williams says she must raise her game against 'cool cat' Naomi Osaka in semi-final
Williams, 39, continues to chase Margaret Court's elusive all-time mark of 24 major titles, after losing four Slam finals since her 2017 victory at Melbourne Park while pregnant.
Australian Open 2021: 'Living a dream,' Karolina Muchova elated after staging comeback win over Ashleigh Barty
The Czech 25th seed looked on her way out after Barty raced through the opening set, but after a medical timeout Muchova returned a different player to win 1-6, 6-3, 6-2.
Australian Open 2021: Jennifer Brady overcomes fellow American Jessica Pegula to seal semi-final berth
Brady is the last woman standing among those forced into a hard 14-day quarantine after arriving in Australia.
Karolina Muchova's only other victory over a top-five was against No 3 Karolina Pliskova at Wimbledon in 2019.
Brady was provided with a bike, weights and later a treadmill, and got down to work in her small hotel room as other players complained publicly about the conditions
Australian Open 2021: Daniil Medvedev finally wins five setter, frustrated Karolina Pliskova knocked out
The win stretched Medvedev's winning streak to 17 matches, including his successful run to the title at the 2020 season-ending ATP Finals.
Ostrava Open: Aryna Sabalenka wins 12 straight games against qualifier Sara Sorribes Tormo in comeback
Aryna Sabalenka lost the first ten games before miraculously recovering to find the court with her groundstrokes and went on to take the next 12 games for a 0-6, 6-4, 6-0 win.
French Open 2020 Round-up: Novak Djokovic beats Ricardas Berankis in straight sets, Sofia Kenin through to third round
Kenin failed to convert three match points with Bogdan serving at 5-1 in the final set. She then saved three break points in the next game and held on to win.
French Open 2020 Round-up: Novak Djokovic eases past Mikael Ymer in straight sets; Karolina Pliskova into second round
Second seed Karolina Pliskova was made to work hard for the win by Mayar Sherif but the Czech's greater experience eventually told as she recovered from a set down to progress 6-7 (9/11), 6-2, 6-4.
US Open 2020: Fourth time's the charm for Dominic Thiem, Naomi Osaka builds on and off the court, and more talking points
US Open 2020 crowned a first-time champion in Dominic Thiem and a third Grand Slam winner in Naomi Osaka in the bubble in New York.
US Open 2020: Naomi Osaka, Victoria Azarenka seek third Grand Slam title, look to continue unbeaten run
On court, both Naomi Osaka and Victoria Azarenka have been breathtaking at the US Open. Off the court, both have taken different paths on social issues.
US Open 2020: Victoria Azarenka pulls off come-from-behind win over Serena Williams to set up final with Naomi Osaka
The unseeded Belarusian fought back to overcome Williams, seeded third, 1-6, 6-3, 6-3 in 1hr 56min under the roof of Arthur Ashe Stadium.
US Open 2020, Women's semi-finals, Match Highlights: Victoria Azarenka beats Serena Williams in comeback win
Follow US Open live scores and coverage as the action moves to the women's singles semi-finals on Day 11.
US Open 2020: Carreno Busta downs Shapovalov in five sets to reach semi-finals; Osaka races past Rogers
Alexander Zverev also reached the last 4 of the US Open as he bounced back from a shocking start to oust 27th-seeded Croatian Borna Coric in four sets.
US Open 2020: Naomi Osaka beats Shelby Rogers in straight sets to set up semi-finals clash with Jennifer Brady
The Japanese 2018 US Open champion brushed aside the 27-year-old American 6-3, 6-4, in 1hr 20min inside Arthur Ashe Stadium.
US Open 2020: Jennifer Brady beats Yulia Putintseva in straight sets to secure first-ever Grand Slam semi-final berth
Brady, seeded 28th, beat her 23rd-seeded opponent Yulia Putintseva 6-3, 6-2, in just 1hr 9min inside Arthur Ashe Stadium.
US Open 2020, Quarter-finals, Tennis Highlights: Pablo Carreno Busta to face Alexander Zverev in last-four; Naomi Osaka vs Jennifer Brady in semis
Follow all the latest action, live scores and more from the US Open 2020 quarter-finals on Firstpost.com's live blog!
Naomi Osaka, who won the US Open two years ago, advanced to the quarterfinals by beating No. 14 seed Anett Kontaveit 6-3, 6-4.