Iga Swiatek’s reign as US Open champion, and world number one, was ended by her nemesis Jelena Ostapenko.
The 22-year-old Pole had not dropped a set on her way to the fourth round, but she had never beaten Ostapenko in three previous career meetings.
Swiatek took the first set with relative ease but then Ostapenko’s sledgehammer of a forehand started finding its mark to level the match.
A one-sided final set saw former French Open champion Ostapenko triumph 3-6 6-3 6-1.
Swiatek’s defeat means that Aryna Sabalenka of Belarus will take over as world number one after the tournament.
Ostapenko will face Coco Gauff in the quarter-finals after the teenager ended the grand slam comeback of mother-of-two Caroline Wozniacki.
The 19-year-old came from a break down in the first and third sets to win both and complete a 6-3 3-6 6-1 victory.
Wozniacki’s return has been one of the stories of New York this year, having come out of retirement after more than three years and two children later.
The 33-year-old former world number one has looked as though she has never been away, but a fired-up Gauff proved just too strong in the deciding set.
Wozniacki got off to a dream start with a break in the first game and a 2-0 lead.
But Gauff quickly got back on the board, levelling at 3-3 before going on to clinch the first set without dropping another game.
Wozniacki cranked up the pressure in the second and Gauff started feeling it as her suspect forehand began to misfire and she was broken for 5-3 as the Dane levelled the match.
Gauff looked uncomfortable as she dropped serve again at the start of the decider, but after pointedly ignoring the advice of coach Brad Gilbert, the wound-up American began firing backhand winners as if they were going out of fashion.
She reeled off the next six games to clinch the victory and let out a loud scream of triumph after converting match point.
“Definitely getting it to 2-1 (in the third set) was the turning point,” said Gauff.
“I got broke and I showed I was still in the match. I started to go for my shots.
“Caroline, it’s like she’s never left, the level she played was amazing. It’s weird because I grew up watching Caroline and when she won the Australian Open, so to be on court with her today was an honour.
“She definitely gets to a lot of balls. I felt a bit like I was playing myself. I knew I had to play aggressive and go for my shots. In some moments I miss but I was happy I could get back and refocus.”
It will be the fifth grand slam quarter-final of Gauff’s still-fledgling career and her second at Flushing Meadows.
“I’ve been in this position before,” she added. “And I think I have confidence in myself that I can go even further.”
Djokovic: Murray is 'perfect' coach to help execute 'big plans'
Novak Djokovic believes former rival Andy Murray is the "perfect" coach for him at this stage of his career as he still has "big plans".
The Serb, a 24-time grand slam winner, announced last week that Murray, who retired after the Paris Olympics, would be working with him during the off-season and through the Australian Open.
Djokovic failed to win a major title for the first time since 2017, though he did clinch a long-awaited Olympic gold medal in August. It is also the first time since 2005 that he did not win an ATP event despite reaching two finals.
Djokovic admitted Murray did not agree to the role straight away, but he thinks it is the best decision he could have come to.
"I took about six months to figure out what I needed at this stage of my career," he told Sky Sports.
"I realised the perfect coach would be someone who has been through the experiences I'm going through, possibly a multiple grand slam winner and world number one.
"We discussed Andy Murray, and I said I would give him a call and see how it goes. It caught him a little off guard. We connected really fast, and he accepted after a few days.
"I couldn't be more excited about it. This collaboration is a surprise to everyone, including me, but it's exciting for tennis."
Djokovic is currently level with Margaret Court for the most major singles titles by any player and needs one more to become the outright leader.
He has a good record in Australia, winning 10 times in Melbourne, beating Murray in four of those finals, with the first major of next season starting on January 12.
The 37-year-old is the only one of the 'Big Four' still playing after Murray and Rafael Nadal's retirements this year, and Roger Federer's in 2022, but he shows no signs of stopping any time soon.
"We all know we have to stop and say goodbye at some point," he added. "Even though it was expected for Rafa and Andy, both of them saying farewell to the sport is a shock for all of us.
"My body is serving me well; I still have motivation to win grand slams. The reason I asked Andy to work with me is because I still have big plans.
"I'll keep going as much as I can feel like I can keep being a candidate for the biggest titles."
Halep questions 'big difference' in doping punishments after Swiatek ban
Simona Halep has hit out at the "big difference" in how doping cases are handled in tennis after Iga Swiatek was handed a one-month ban on Thursday.
World number two Swiatek accepted the one-month suspension after testing positive for the banned substance trimetazidine (TMZ), the International Tennis Integrity Agency (ITIA) said.
Two-time Grand Slam champion Halep, meanwhile, was provisionally suspended in October 2022 after testing positive for roxadustat and later banned for four years in September 2023.
The ban was then reduced to nine months after the Romanian's appeal at the Court of Arbitration for Sport in March this year.
"I stand and ask myself, why is there such a big difference in treatment and judgement?" Halep posted on Instagram.
"I can't find and I don’t think there can be a logical answer. It can only be bad will from ITIA, the organisation that has done absolutely everything to destroy me despite the evidence."
While reducing Swiatek's ban, the ITIA accepted that the positive test was caused by contamination of the regulated non-prescription medication melatonin which the five-time Grand Slam champion took for jet lag and sleep issues.
Halep, 33, had also argued that she had taken a contaminated supplement.
"I lost two years of my career, I lost many nights when I couldn't sleep, thoughts, anxiety, questions without answers," Halep said.
"How is it possible that in identical cases happening around the same time, ITIA to have completely different approaches to my detriment?"
Meanwhile, the ITIA has said that there were "very important differences" between the two cases.
"No two cases are the same, they often involve different circumstances, and direct comparisons are not always helpful," the ITIA told BBC Sport.
"The product contaminated in Ms Swiatek's case was a regulated medication, not a supplement."
Swiatek accepts one-month suspension after testing positive for banned substance
Five-time Grand Slam champion Iga Swiatek has accepted a one-month suspension after testing positive for a banned substance.
The world number two tested positive for trimetazidine, a heart medication known as TMZ, after providing an out-of-competition sample in August 2024. She was world number one at the time.
The International Tennis Integrity Agency (ITIA) have determined the source was a contaminated nonprescription medication, melatonin, used for issues with jet lag and sleeping.
The ITIA thus concluded that Swiatek was not responsible for significant fault or negligence in the test. Therefore, the suspension will last just one month.
ITIA chief executive Karen Moorhouse said: "Once the source of the TMZ had been established, it became clear that this was a highly unusual instance of a contaminated product, which in Poland is a regulated medicine.
"However, the product does not have the same designation globally, and the fact that a product is a regulated medication in one country cannot of itself be sufficient to avoid any level of fault. Taking into account the nature of the medication, and all the circumstances, it does place that fault at the lowest end of the scale."
It is the second high-profile doping case this year, as Jannik Sinner failed two tests for a steroid in March but was cleared in August.
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