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.
Sinner inspires comeback to help Italy reach Davis Cup semi-finals
Jannik Sinner kept Italy's hopes of retaining the Davis Cup alive after winning matches in the singles and doubles to inspire a 2-1 comeback triumph over Argentina on Thursday.
Sinner and Matteo Berrettini edged Maximo Gonzalez and Andres Molteni 6-4 7-5 in the deciding game to set up a rematch of last year's showpiece against Australia in the final four.
However, the Italians started off on the back foot when Francisco Cerundolo downed Olympic bronze medallist Lorenzo Musetti 6-4 6-1 in an hour and 29 minutes.
Musetti converted just two of the eight break points he was presented with, as Cerundolo put Argentina on the brink of reaching the semi-finals for the first time since 2016.
But two-time grand slam champion Sinner, who won the ATP Finals last weekend, carried his momentum forward from Turin against Sebastian Baez.
The world number one breezed to a 6-2 6-1 win over his opponent, serving seven aces to the Argentine's one, while also saving all four break points he faced.
Sinner then returned to the court alongside Berrettini, with the pair replacing Simone Bolelli and Andrea Vavassori in the must-win clash.
The pair won 90% of their first-serve points and fended off all five break points they faced, earning a key break at 5-5 in the second set before surging to victory.
"It was a must-win match," said Sinner. "Very different conditions. The court is very, very fast and tough to play.
"I haven't had so much time to adapt to the conditions, but I'm happy about today."
Data Debrief: The Italian Job
Italy edged closer to becoming only the sixth nation to retain the Davis Cup since the final stage was introduced 52 years ago, and first since the Czech Republic in 2013.
But they were inspired by Sinner once again, who proved why he will end the year at the summit of the ATP rankings.
And after leading Italy to their first Davis Cup title since 1976 with a victory against Australia's Alex de Minaur last year, he will fancy his chances this time around.
Ebden and Thompson send Australia to third straight Davis Cup semi
Matthew Ebden and Jordan Thompson booked Australia's place in the Davis Cup semi-finals after the pair clinched their deciding match against the United States to win 2-1.
The pair, who won gold at the Paris Olympics, beat Tommy Paul and Ben Shelton 6-4 6-4 to put Lleyton Hewitt's side into their third successive semi-final at the men's team event.
Australia, who have won the tournament 28 times, largely had Thanasi Kokkinakis to thank after his remarkable triumph over Shelton in the first match of the day.
Kokkinakis saved four match points and let slip six of his own before eventually prevailing 6-1 4-6 7-6 (16-14) in an engrossing encounter that lasted two hours and 14 minutes.
However, in the rematch of a recent ATP Finals group-stage match, Taylor Fritz emerged victorious over Alex De Minaur as he did in Turin a week ago.
Despite De Minaur going 2-0 up in the second set, Fritz roared back to earn a 6-3 6-4 victory to send the tie the distance in Malaga.
But Australia held their nerve, and will discover their opponents later on Thursday when reigning champions Italy take on Argentina.
Ebden and Thompson’s win came after United States’ captain Bob Bryan opted for a late change, with Paul and Shelton replacing Austin Krajicek and Rajeev Ram.
“We were expecting the other pair, but we knew they’ve got incredible players who can play doubles,” said Ebden.
“We were ready. A slight adjustment obviously. More huge serving singles players than the doubles craft, maybe, but it was just as big a challenge as any.
"Out here, finals live match, just to play with Jordan here was real fun. Following what Kokk did, unfortunately Alex went down, but what a day. So fun, so happy.”
Data Debrief: Australia ready to right Davis Cup wrongs
Australia have failed to win the Davis Cup since 2003, but they will be confident of halting that streak this time around.
If they take the trophy, they will have reason to thank Kokkinakis, whose tie-break win against Shelton was the longest an Australian player had featured in at the tournament, surpassing Pat Rafter's win over David Rikl in the 1997 quarter-finals of the competition (15-13).
Ebden and Thompson also shone when it mattered most, serving four aces compared to Paul and Shelton's two, while also winning 92% of their first-serve points.
McKenna fired up for 'biggest game in world football' against Man United
Kieran McKenna believes Ipswich Town's Premier League clash with Manchester United will be the "biggest game in world football" this weekend.
United are in action under new manager Ruben Amorim for the first time since the Portuguese officially replaced Arne Slot as head coach.
While plenty of focus is on the visitors at Portman Road, Ipswich are fired up after beating Tottenham 2-1 before the international break.
That was Ipswich's first league win of the season – and their first in the Premier League in 22 years – and now attention turns to facing United.
McKenna, who previously coached United, said at a fan event this week: "Sunday, what a game. It's one we're really, really looking forward to.
"Not for the personal connection, but as manager of Ipswich Town, to be on that stage, it's what we've worked so hard for.
"It's the biggest game in world football anywhere this weekend, the biggest game in the world in the biggest sport in the world and it's at Portman Road."
Ipswich's surprise win at Tottenham last time out moved them up to 17th, while United are 13th after beating Leicester City 3-0 in Ruud van Nistelrooy's final game in caretaker charge.
Amorim took his first training session on Monday, albeit with many first-team stars away on international duty, and the former Sporting CP boss believes his style of play will be clear to see from the off.
"I think you will see an idea," he told the club's website. "You could like it or not, I don't know, but you will see an idea.
"You will see a positioning. You will see something that we want to reach that kind of level. You will feel that.
"We have to know it's [only] two trainings before the first match. This is the best league in the world. But if I have to say something to you, [it's that] you will see an idea. This I can guarantee."
PLAYERS TO WATCH
Ipswich Town - Liam Delap
Delap scored what proved to be Ipswich's winner against Tottenham and has now netted six of his side's 12 Premier League goals this term.
That makes the Manchester City academy product one of only three players to have scored at least half of his side's goals in the competition this season, along with Erling Haaland at City (55%) and Chris Wood at Nottingham Forest (53%).
Manchester United - Alejandro Garnacho
Garnacho was among the scorers against Leicester two weeks ago and has now been directly involved in 20 Premier League goals for United (13 goals and seven assists).
The Argentina international is one of only two non-British players to reach that figure for United before turning 21, along with Cristiano Ronaldo (25 goals).
MATCH PREDICTION: MANCHESTER UNITED WIN
Ipswich are seeking back-to-back Premier League wins for the first time since February 2022, with that run also beginning with a 2-1 victory against Tottenham.
The Tractor Boys are the only side in the competition without a home win this season. Only five newly promoted clubs have failed to win any of their first six home matches, all of whom went back down.
United have won 17 of their past 19 Premier League games against newly promoted opponents, meanwhile, including nine wins in a row in away fixtures.
The Red Devils were 1-0 winners on their most recent league trip to Portman Road in April 2022, but only once have they won successive league games away to Ipswich.
However, the Tractor Boys have lost four of their past five league matches against Man United, failing to score in each of those losses.
OPTA WIN PROBABILITY
Ipswich Town - 22.2%
Draw - 23%
Manchester United - 54.8%
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