Wimbledon champion Venus Williams was pushed to the limit before beating third seed Jelena Jankovic of Serbia 4-6 6-1 7-6 on Wednesday to reach the US Open semi-finals.
The world number 19 said her victory was reward for her father Walter.
"Right now I am mentally and physically tired," said Clijsters after being beaten in the Swisscom Challenge semi-finals by Jelena Dokic.
The world No. 1 was beaten by unseeded Russian Lina Krasnoroutskaya in the third round of the Canadian Open.
Serena Williams has used her painful defeat at the French Open to spur her on at Wimbledon.\n\n
The world No. 1 joined Kim Clijsters, Justine Henin-Hardenne and Nadia Petrova in the semi-finals of the French Open.
The world No. 1 was beaten by Justine Henin-Hardenne in the final of the Family Circle Cup.
The Russian battled back from a set down to beat French Open champion Justine Henin-Hardenne in the final.
Iga Swiatek clinched her second French Open title after defeating American teenager Coco Gauff
List of French Open women's singles champions
The 20-year-old, looking to become the first unseeded woman to lift the Suzanne Lenglen Cup since 1933, blazed her way to the final, hitting winners and errors with reckless abandon.
The Australian Open has seen many unheralded players punching above their weight. Rediff.com takes a look at a few such unseeded players who went the distance in the new millennium.
Images from the women's singles final at the French Open, in Paris, on Saturday.
List of French Open women's singles champions:
Simona Halep became the first Romanian in 40 years to lift the French Open trophy at Roland Garros on Saturday.
Osaka was fined $15,000 for skipping her news conference after her first round win and was warned of possible expulsion from Roland Garros
List of French Open women's singles champions
World number one Ash Barty has decided to retire from professional tennis at the age of 25 and at the peak of her game, citing the fulfilment of her tennis goals and fatigue with life on the Tour.
The 13th seeded Czech proved too strong for Serb, who lifted the Suzanne Lenglen Cup in 2008, winning 7-5, 6-4.
Following is a list of American Serena Williams' 22 grand slam singles titles as she equalled Steffi Graf's professional era record with victory at Wimbledon on Saturday
Serena Williams, who had come into the first Grand Slam since in Auckland claiming her first title since becoming a mother, suffered an error-strewn 6-4, 6-7(2), 7-5 defeat by China's Wang Qiang in the third round at the Australian Open on Friday.
Here is a list of US Open women's singles champions since the open era began in 1968:
Following Iga Swiatek's victory over Coco Gauff in the final, here's a list of French Open women's singles champions:
Jennifer Brady spent two weeks in hard quarantine gathering mental strength for her tilt at a maiden Grand Slam title and will hope there is plenty in reserve when she takes on Naomi Osaka in Saturday's Australian Open final.
IMAGES from Day 11 of the French Open at Roland Garros in Paris on Wednesday.
Swiatek's last defeat on clay came in the WTA 1000 event in Madrid against Australian Barty, who elected not to defend her 2019 French Open title last year due to the COVID-19 pandemic.
Factbox on Russia's Maria Sharapova who was banned until January 2018 on Wednesday after testing positive for the banned drug meldonium at this year's Australian Open.
The Pole said she wanted to do better this time and felt the pressure.
The unseeded Ostapenko, 20, downed Romanian third seed Simona Halep 4-6, 6-4, 6-3 in the final, hitting a staggering 54 winners and taking her tournament tally to 299.
Take a look at the profile of Maria Sharapova who told a news conference on Monday she failed a drugs test.
Factbox on Wimbledon champion Marion Bartoli, who announced her retirement from tennis at 28 after a second round loss at the Western and Southern Open in Cincinnati on Wednesday.
Garbine Muguruza's chances of winning her maiden grand slam title -- and achieving the rare feat of beating Serena Williams twice in three years at Roland Garros -- may well depend on which version of the world number one turns up on Sunday.
Images from Day 9 of the 2021 French Open at Roland Garros in Paris on Monday.
While 40 have tried only nine times have both Williams sisters been beaten by the same player at the same tournament and that list reads like a Grand Slam Hall of Fame with names that include; Steffi Graf, Martina Hingis, Lindsay Davenport, Justine Henin and Kim Clijsters, who like Pliskova, pulled the double off at the US Open.
Serena Williams capped off a season to remember by capturing her fourth WTA Championship title with a 2-6, 6-3, 6-0 win over Li Na on Sunday.
Taiwan's Hsieh Su-wei has enjoyed double good fortune at Melbourne Park this week.