The 26-year-old American, winner of eight Grand Slam titles, had pulled out of the event last year due to illness.
Karolina Pliskova reached the Australian Open quarter-finals for the first time on Monday and is keen to prove right those tipping her for Grand Slam success.
A round-up of the fourth day's play at the French Open.
Venus Williams' return to action following a five-month injury layoff ended in defeat.
Former world number one Caroline Wozniacki shocks tennis world with comeback announcement
Roger Federer and Serena Williams came through their first real tests at the US Open on Saturday with flying colours as the casualty toll at the last Grand Slam of the year soared to record numbers. The former world number ones both played dangerous opponents but survived to fight another day, advancing safely to the fourth round at Flushing Meadows.
World number eight Williams, who captured the first of her six US Open titles two years before her 17-year-old opponent was born, spent the first half of the match trying to find her rhythm but when she did she was off to the races.
Your weekly shot of wisdom from super achievers.
The world No. 1 joined Kim Clijsters, Justine Henin-Hardenne and Nadia Petrova in the semi-finals of the French Open.
Serena Williams powered into the fourth round of the Australian Open on Saturday with a 6-2, 6-1 demolition of Dayana Yastremska then consoled the Ukrainian teenager after leaving her in tears.
Images from Day 2 of the 2020 US Open in New York
Ailing knees, Father Time and even a resurgent Victoria Azarenka stand in the way of Serena Williams clinching her seventh Australian Open title and giving her one more shot at an achievement that would cap her storied career.
A year after Serena Williams and Naomi Osaka were both caught up in a whirlwind of conflicting emotions, both will be trying to make history in the US Open final on Saturday.
Some players and pundits have criticised the rule as being hard to police, spottily enforced and highly subjective, and called for the ban on coaching from the players' box to be lifted.
Defending champion Serena Williams reached the semi-finals of the Western & Southern tournament in Cincinnati but not before having her mettle tested in a 3-6, 6-4, 6-2 win over sixth-seeded Serb Ana Ivanovic on Friday.
World No 1 and top seed Serena Williams was knocked out of the Australian Open by Serbian Ana Ivanovic on Sunday.
'For me, I don't feel sad because I wouldn't even know what I'm expected to feel'
'She's a fighter on the court. She's playing really great, especially on the grass. She's attacking that ball really well. She doesn't let anything limit her'
Images from Day 2 of the French Open matches played at Roland Garros on Monday
Serena Williams remains the 'queen' of women's tennis but don't be surprised if she's no longer No 1 by the end of the year, Martina Navratilova said Thursday.
Serena Williams, who won the Australian and Wimbledon Grand Slam titles last year, was voted the WTA Tour 2009 Player of the Year for a second successive season, at a ceremony in Miami on Wednesday.
Williams reached the final of the mixed team event earlier this year with American compatriot John Isner to kick off a superb season where she won the Australian and French Opens and Wimbledon to take her grand slam singles haul to 21.
As the fans head toward Flushing Meadows, tennis stars gear up with ground-breaking styles to rule the courts.
Top-seeded world number one Williams overpowered Russian left-hander Ekaterina Makarova 6-1 ,6-3, unleashing her daunting firepower against the 17th-seeded Russian. Wozniacki advanced when China's Peng Shuai broke down in scary distress due to heat illness and retired in the second set, while trailing 7-6(1), 4-3.
American Serena Williams was third time lucky as she finally equalled Steffi Graf's long-standing record of 22 Grand Slam wins after defeating Germany's Angelique Kerber 7-5, 6-3 in the Wimbledon final on Saturday.
Agnieszka Radwanska showed why she should be considered among the favourites for the Australian Open later this month by beating world number one Serena Williams in the final of the Hopman Cup in Perth on Saturday.
Coaching during matches is permitted in some women's events, but Grand Slam tournaments are among those which do not allow it.
Top-seeded Serena Williams said on Friday that she was not sure about the state of her balky right shoulder but felt more relaxed entering next week's US Open than last year.
Serena Williams is chasing Australian Margaret Court's record 24 Grand Slam singles titles
Sharapova's quarter-final defeat by Williams at the 2016 Australian Open was the last competitive match the Russian played for 15 months after she received a doping ban while American Williams was on a maternity break for most of 2017.
Installed by bookmakers as the favourite to win Wimbledon and a first grand slam title after stunning holder Serena Williams in the last 16 on Monday, Sabine Lisicki flashed a winning smile that belied any feelings of pressure.
Serena Williams came away with a 6-3, 7-5 victory over Angelique Kerber in the first round of the US Open.
On the men's side, the fields have already been divided into two ATP 250 tournaments.
Serena 'out of line' but both sides share blame says King
Standing in Czech Karolina Pliskova's way of achieving a first Grand Slam title is top seed Barty who is aiming to lift the Venus Rosewater Dish for the first time herself.
Iga Swiatek will be looking to join a select band of players who have lifted the Suzanne Lenglen Cup four times
The WTA Bangalore Open event will take place in February.
American Serena Williams barged her way into the second round at Wimbledon on Monday with a 6-1 7-5 victory over Portuguese qualifier Neuza Silva.
The first teenager to play in a US Open final since Serena in 2001 there was symmetry to the moment as Gauff rallied to beat the second seeded Belarusian 2-6, 6-3, 6-2 and end a six-year barren stretch for American tennis fans, who were finally able to celebrate a homegrown champion.
How Nadal surpassed the haul of Roger Federer and Novak Djokovic.