Second seed Stefanos Tsitsipas has blown a strong position to be knocked out of the Miami Open by world number 37 Hubert Hurkacz in three sets on Thursday night.
The Polish 26th seed lost the first set and trailed 0-2 in the second with Tsitsipas having two break points, before fighting back for an outstanding 2-6 6-3 6-4 triumph.
The victory seals Hurkacz's place in his first-ever Masters 1000 semi-final where he will face Russian fourth seed Andrey Rublev.
On Thursday night, Rublev won 7-5 7-6 (9-7) over Sebastian Korda, ending the young American's exceptional run in Miami.
Tsitsipas's demise was the major story on Thursday, having only dropped one set in his previous three matches in Miami.
The Greek world number five was in form, having made February's Australian Open semi-finals and last week's Mexican Open final.
Tsitsipas was in control until Hurkacz dialed up his aggression in the second, producing a brilliant flick after the Greek's volley to take advantage at 2-2.
Hurkacz got the crucial break at 2-2 in the third when the Greek coughed up a mistake by missing a routine smash.
The 24-year-old Pole also sent down 15 aces in a breakthrough win.
"It is so big," Hurkacz said in his on-court interview about reaching his maiden Masters 1000 semi-final.
"I was trying to keep fighting and that’s what I did. [I am] super pumped and happy that I was able to turn this match around.
"He was returning very well and I had to play a lot of rallies. At the beginning of the match, I tried to go for too much, so then I was trying to adapt my game a little bit."
Rublev claimed his 20th ATP Tour win for the calendar year, the most of any player ahead of Daniil Medvedev and Tsitsipas with 17, to book his semi-final spot against Hurkacz.
The defeat ended 20-year-old Florida resident Korda's superb run, where he claimed his first top 20 win against Fabio Fognini and first top 10 victory against Diego Schwartzman.
Nadal unsure of future involvements after Laver Cup withdrawal
Rafael Nadal says he cannot commit himself to future tournaments after his withdrawal from the Laver Cup.
Nadal shared news on Thursday that he would not make an appearance at the annual event in Berlin, stating that it would not be in the best interests of Team Europe if he were to participate.
The Spaniard was last in action playing doubles at the Paris Olympics with Carlos Alcaraz, and while he says he is in a good space mentally, he was not able to confirm when he would next make a professional appearance on a tennis court.
He said: "Mentally, I’m good, no problems. I'm at home enjoying other things, training as much as I can every day.
"No drama, obviously these are decisions [the Laver Cup withdrawal] that are being made, and this was a possibility - it's been a while without competing. There will be someone else who can do better.
"Right now I’m not in a position to put myself down for anything.
"I said [I would play] until the Olympics and then we would see, and I'm in that period of rest."
Nadal has endured a difficult 2024 so far, playing just 21 competitive singles matches with a record of 13-8.
He has only one grand slam victory to his name this year, beating Jack Draper in the Australian Open, but he lost in the first round of the French Open to eventual finalist Alexander Zverev.
Alcaraz sends Spain into Davis Cup last eight
Carlos Alcaraz has led Spain to the quarter-finals of the Davis Cup Finals after a straight-sets win over Ugo Humbert.
The 21-year-old needed just one hour and 21 minutes to cruise through with a 6-3 6-3 victory, hitting 21 winners to his opponent's 14 as he backed up Roberto Bautista's win earlier on.
Bautista had to come from behind to edge past Arthur Fils, beating him 2-6 7-5 6-3, and converting 40% of his break points, bettering the Frenchman's 27%.
Spain are through in Group B, but elsewhere in Group D, US Open semi-finalist Jack Draper's return was unable to inspire Great Britain to victory.
Dan Evans was beaten by Tomas Martin Etcheverry earlier on Friday before Draper's first match since New York ended in a straight-sets 7-6 (7-4) 7-5 defeat to Francisco Cerundolo.
Despite making fewer unforced errors than the Argentinian (23 to 39), the British number one struggled to find an edge, though Evans and Neal Skupski claimed a consolation win in the doubles to make it 2-1.
They sit second in the group, missing the chance to qualify for the last eight, and now needing a win against Canada, who have been in fine form so far.
Auger-Aliassime and Shapovalov sweep aside Finland at Davis Cup
Felix Auger-Aliassime and Denis Shapovalov moved Canada to the brink of qualification in the Davis Cup Finals group stage, comfortably dispatching Finland in Manchester.
Shapovalov needed just an hour and 13 minutes to beat Eero Vasa 7-6 (7-2) 6-2, backing up his win against Argentine Francisco Cerundolo on Tuesday.
The Canadian served five aces to his opponents' three, producing three love games in the final set to get his nation off to a flying start.
Auger-Aliassime followed up Shapovalov's victory with another straight sets win, this time over Otto Virtanen, emerging a 6-2 6-3 victor.
The world number 21 was dominant on serve throughout his 73-minute triumph, saving all three break points he faced and winning 86% of his first-serve points.
Auger-Aliassime and Shapovalov then prevailed in the doubles against Harri Heliovaara and Virtanen in another straight sets win, putting them top of Group D without dropping a set against their opponents.
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