Having lost to Wimbledon champion Elena Rybakina in the fourth round of the Australian Open, top seed Iga Swiatek is no longer competing.
Rybakina, who was seeded 22nd, had trouble repeating the performances that helped her win at the All England Club in July.
However, in a 6-4 6-4 victory at Melbourne Park over Swiatek, the Kazakh once again demonstrated how she excels in front of a large audience.
A little under 30 minutes later, Coco Gauff suffered a 7-5, 6-3 defeat. Ostapenko, Jelena.
18-year-old American seventh seed Gauff, who was one of the favorites to win, was defeated by Latvia's 17th seed.
Instead of Swiatek and Gauff, as many had anticipated, Rybakina, 23, will face former French Open champion Ostapenko in the quarterfinals.
"I get anxious every time I play on the court, but I try to remain composed. I'm excited to advance to the next round after such a significant victory, Rybakina said.
fourth seed. Judith Pegula. , the highest-ranked player still playing in the women's draw, defeated Czech Barbora Krejcikova 7-5, 6-2.
The American could compete against Victoria Azarenka, a two-time champion of Melbourne. If Azarenka defeats Zhu Lin later on Sunday, she will play in the quarterfinals.
"Wanting it too much," Swiatek said.
Following the retirement of Australia's Ashleigh Barty, Poland's Swiatek ascended to the top of the world rankings last year. She later won the French Open and the US Open while dominating the WTA Tour.
After a remarkable 2022, she returned with the goal of becoming the first woman since Serena Williams in 2015 to hold three of the four major titles. Last year, she advanced to the semifinals in Melbourne.
"I felt like I stepped back in terms of how I approach these tournaments and maybe wanted it a little bit too hard," she said.
I'll try to unwind a little more as a result. ".
Success for Rybakina has been more erratic. She won just 14 of her 24 matches between winning the most prestigious tennis title and the opening of this year's Australian Open, and she has spoken out about the lack of respect she believes she has received.
Her world ranking is lower than expected after receiving no points for her Wimbledon victory, and she has struggled with difficult draws.
But she made yet another strong impression at Melbourne Park, making it to the last eight for the first time with a convincing victory over Swiatek.
Early in the first set, the two players traded breaks. At 3-3, Swiatek's double fault gave Rybakina another opportunity, which she took with a huge cross-court backhand winner.
Swiatek improved at the start of the second set and raced into a 3-0 lead, but the one-set advantage was secured by a confident hold to love.
Swiatek struggled to handle Rybakina's heavy serve as she quickly fought back and leveled the score at 3-3.
She only allowed six points to be scored on her first serve throughout the entire game, and after breaking for a 5-4 lead, she successfully held her opponent to a single point to win.
Rybakina claims she is no longer "bothered" about not earning ranking points at Wimbledon, but improving her world ranking in Melbourne is what keeps her motivated.
"For sure it's motivation, but as I've said before, every tournament I go to, I want to win and no matter points, no points," she said.
No matter what sport I play, I enjoy competition. I would say for the time being that I don't really consider these things. ".
Ostapenko claims she has "never doubted" she can capture another major.
Many have written off Ostapenko as a one-hit wonder due to her lack of significant runs since she won the French Open as a teenager. That was almost six years ago.
She did, however, demonstrate the forceful hitting and aggressiveness that helped her win the Roland Garros title in 2017.
In addition to breaking Gauff's serve three times, Ostapenko hit 30 winners and thwarted seven of the American's eight break attempts.
Despite reaching a major quarterfinal for the first time since Wimbledon in 2018, Ostapenko, 25, claims she "honestly hasn't really doubted" that she could win another.
Ostapenko, who had never advanced past the third round at Melbourne Park, stated that it took her a few years to truly adjust to what had happened because of how much her life had changed.
"I have always been aware of and confident in my abilities. I can beat almost anybody if I play well.
"I tried to improve my consistency, especially during the preseason, so that I could simply enter the court and play my game. ".
In her previous three matches, including a victory over British No. 1 Emma Raducanu in the second round, Gauff had not lost a set.
The adolescent star, who fell to Swiatek in the 2017 French Open final, broke down in tears during her press conference as she continued to wait for a major victory.
Gauff claimed, "I think every loss is somewhat in my control because I do feel like I'm a good player, but today she just played better.
"There were times during the match when I was getting frustrated because, even though I can usually solve problems, I felt like I had few solutions to what she was doing.
"There were a few areas I could have done better, but overall I think she deserved to win," I said.