Ash Barty crashed out of the Adelaide International at her first hurdle after going down in straight sets to Danielle Collins.
It took only 65 minutes for American Collins to defeat the defending champion and world number one in a 6-3 6-4 triumph.
Barty, who had a bye in the first round, did have opportunities, breaking in the first game of the match and building a 4-1 lead in the second set.
But on both occasions Collins stormed back, claiming her first win in four attempts against home favourite Barty, who had beaten her in the semi-finals of last year's tournament.
Coco Gauff continued her fine run to reach a first WTA quarter-final since August 2020 with an impressive comeback win over sixth seed Petra Martic.
The American triumphed 5-7 6-3 6-4 in two hours and 12 minutes to book a clash with compatriot Shelby Rogers at the WTA 500 event.
Gauff did not relinquish serve once after losing the first set and did not even offer up a break-point chance in the decider, which she sealed with a pivotal early break secured with a passing winner.
"I go into every tournament thinking that I can win," said the 16-year-old.
"Obviously that's impossible, to have a perfect record, but I go into every tournament believing that I can win.
"I try not to think far ahead in the match, at least I just try to focus on my next match, just because you have to get through that before you can get to the finals, and just take it one match at a time."
Second seed Belinda Bencic will face Storm Sanders in the quarter-finals after a 6-1 6-3 win over Misaki Doi.
In a match where she was not quite as dominant as the scoreline suggests, Bencic had to fend off 12 break points but was successful in saving 10 of them.
Number four seed Elise Mertens withdrew before her match with a shoulder injury, so Anastasija Sevastova beat lucky loser Christina McHale to set up a last-eight tie with Jil Teichmann.
Raducanu stunned by qualifier Carle in Madrid
Maria Lourdes Carle made a splash at the Madrid Open on Wednesday, as the qualifier sent Emma Raducanu packing.
World number 82 Carle stepped into the void to fill in for Karolina Pliskova, who withdrew prior to the end of the qualifying rounds, to face 2021 US Open champion Raducanu.
It is just the second time Carle has reached the main draw of a WTA 1000 event, and she ensured it would be a memorable campaign after a 6-2 6-2 victory over Raducanu, who is now ranked at world number 221, though has enjoyed something of a return to form this season.
Raducanu reached the quarter-finals of the Stuttgart Grand Prix last week, going down to world number one Iga Swiatek, but has recently enjoyed victories over the likes of Angelique Kerber and Caroline Garcia.
Data Debrief
Carle is the first player from Argentina to defeat a former women's singles grand slam Champion since Nadia Podoroska overcame Serena Williams in Rome in 2021.
The 24-year-old is making just her sixth WTA main draw appearance, with her first WTA 1000 appearance having come in Miami in March.
'I will play Roland Garros if I feel competitive' – Nadal uncertain on French Open participation
Rafael Nadal is unsure as to whether he will be fit enough to feature at the French Open.
Nadal is embarking on a swansong season, having indicated he will retire after the 2024 campaign.
The 37-year-old is set to make his farewell appearance at the Madrid Open this week, with his campaign starting against American teenager Darwin Blanch on Thursday.
Nadal, now ranked 512 in the world, has played just five Tour-level matches this year, as he makes his comeback from yet another injury lay-off.
And the 14-time Roland Garros champion acknowledged on Wednesday that he would be unlikely to play at the French Open should it be taking place this week.
"If I was in Paris today, I wouldn't go out to play," he said.
"I don't think I'll be able to play at 100 per cent, but it's important to be able to play for the last time in Madrid.
"It means a lot to me to play on this court where I've had some great moments."
Thankfully for Nadal, the French Open does not take place until late May, giving him time to get fit.
"If I arrive in Paris the way I feel today, I will not play," he said.
"I will play Roland Garros if I feel competitive. If I can play, I play. If I can't play, I can't. It won't be the end of the world or the end of my career. I still have goals after Roland Garros, like the Olympics.
"Few weeks [ago], I didn't know if I would be able to play again on the professional tour. It's not perfect but at least I am playing and I can enjoy again, especially in the tournaments that are so emotional for me.
"I'm able to enjoy the fun that I can say, probably, goodbye on court. Without trying to confuse anyone, I don't know what's going to happen in the next three weeks.
"I'm going to do the things I have to do to be able to play in Paris. And if I can, I can and if I can't, I can't. I'm going to Paris if I feel like I'm good enough. I'm going to Paris if I feel capable enough to compete."
Nadal played three times in Brisbane in January, losing to qualifier Jordan Thompson and subsequently missing the Australian Open.
He featured twice in Barcelona earlier in April, losing to Alex De Minaur in the round of 32.
Nadal has won five titles in Madrid, though, and the tournament holds a special place for him, as he underlined his determination to compete.
He added: "Some moments I find myself enjoying being on court, playing against the best players again and I feel myself, more or less competitive, and other moments I feel limitations and it’s difficult.
"The goal is to be on court, enjoy it as long as possible. I mean, that's the thing, enjoy the fact that I will be able to compete one more time on the professional tour and here at home in Madrid, a place that gives me everything in terms of support.
"I am here giving myself a chance. If at some moment my situation improves, if I am able to find better feelings in my body, I need to be ready."
Liverpool line up Feyenoord coach Slot as Klopp replacement
Arne Slot appears to be at the front of the queue to replace Jurgen Klopp as Liverpool manager.
Klopp confirmed in January that he would be leaving the Reds at the end of the season.
Xabi Alonso, who has led Bayer Leverkusen to their first Bundesliga title, was swiftly established as a leading candidate to take the helm at Anfield, where he starred as a player for the Reds between 2004 and 2009.
The 42-year-old, however, is staying put in Germany, and Liverpool's search for Klopp's successor has taken them to Feyenoord's door.
Slot has been previously linked to jobs in the Premier League. Leeds United wanted to appoint him last season before their relegation to the Championship, while he was targeted by Tottenham before they appointed Ange Postecoglou.
The Dutchman intimated when linked with Spurs: "A normal next step would be to go abroad and I've always said that the best league in the world is the Premier League."
Ideally, Liverpool will be aiming for a coach who can come close to replicating Klopp's style of play, and in particular has a flair for working with and developing young players.
Slot has enjoyed fantastic success in Rotterdam. He became Feyenoord head coach in December 2022, after leaving AZ, and went on to win the Eredivisie title in 2022-23, having reached the Europa League final in the previous season.
The 45-year-old has a 64.4 per cent win record from 146 games in charge, winning 94, drawing 29 and losing just 23.
His Feyenoord team have scored 329 goals, an average of 2.2 per match, conceding 147 in return. Slot's points per game is a hugely impressive 2.13.
Feyenoord are, though, set to relinquish their Eredivisie crown, as they trail leaders PSV by nine points. They have, however, won the KNVB Cup this term.
As there is no break clause in the Dutchman's contract, it has been reported that a compensation fee in the region of €10million (£8.5m) could prise him away from Feyenoord.
Sporting CP boss Ruben Amorim is another coach who has been heavily linked with the Liverpool job, albeit he is reportedly in talks with West Ham.
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