Novak Djokovic's hopes of becoming the first man to win a calendar Golden Slam were crushed by a semi-final defeat to Alexander Zverev at the Tokyo Olympics.
From a set and a break up, Djokovic dropped a staggering eight games in a row on his way to a 1-6 6-3 6-1 loss.
The 34-year-old Serbian had been unsure about coming to the Games but was swayed by the pride he takes in representing his country and the tantalising opportunity to add a gold medal to a potential clean sweep of the grand slams.
He has already won the Australian Open, French Open and Wimbledon, and will head to the US Open in August as a heavy favourite regardless of this setback.
But this was just not Djokovic's day, despite him making a whirlwind start and dominating until the point he broke to lead 3-2 in the second set. From there, Zverev seized control.
When Djokovic volleyed into the net to make it 3-3, dropping serve for the first time in the match, it looked like just a minor stumble.
Yet suddenly he was struggling for form and did not win another game until he was already 4-0 behind in the deciding set.
Zverev was playing blindingly brilliant tennis and was proving obdurate too, saving four break points in the second game of the third set.
He clinched victory with a blazing backhand winner, and goes on to face Russian Karen Khachanov in the final.
The result means Djokovic, like Roger Federer, seems fated never to win the Olympic singles gold medal. And it leaves Steffi Graf as the only player to ever win a calendar Golden Slam, having done so in 1988 when she added the Seoul Olympics title to her haul of majors.
Russian Olympic Committee's Khachanov fended off Spain's Pablo Carreno Busta with some ease in the first semi-final, with the world number 25 sweeping to a 6-3 6-3 victory in an hour and 19 minutes.
He won 26 of 28 points on first serve to freeze out Carreno Busta, who had only one break point all match and could not take that opportunity.
"It's just a pure happiness, a pleasure to be here to live those moments, these kind of memories will stay forever," Khachanov said.
Khachanov delivered a rock solid display, with his serve and forehand at their best, barely giving his opponent a sniff of an opportunity as the Moscow-born 25-year-old established a firm grip.
"That's the way I prepared, against every opponent you play a little bit differently," Khachanov said. "The final will be another story, another match, another day. I hope it will be the same."
Carreno Busta, who will face Djokovic for the bronze medal, said: "It was not the best match I have played, but Karen was unbelievable today, playing very aggressive and serving really good."
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.
Nadal confirms Laver Cup withdrawal to help Team Europe 'deliver the win'
Rafael Nadal confirmed he will not participate in next month's Laver Cup, believing there are "other players who can help the team deliver the win" for Team Europe.
Nadal last played at the Paris Olympics alongside Carlos Alcaraz in the men's doubles, with the Spanish duo knocked out at the quarter-final stage at Roland Garros.
The 38-year-old also competed in the singles but was hampered by a thigh problem in Paris and suffered a second-round loss to eventual gold medallist Novak Djokovic.
Nadal participated in the inaugural edition of the Laver Cup seven years ago, defeating Jack Sock to help Team Europe claim a 15-9 victory.
It is yet to be confirmed who will replace the 22-time grand slam champion in Berlin next month as captain Bjorn Borg now goes in search of adding to his star-studded line-up.
Alexander Zverev, Alcaraz, Daniil Medvedev, Casper Ruud and Stefanos Tsitsipas have already been confirmed as the participants to face Team World in Berlin.
Nadal posted a statement on social media, saying that he was making the decision for the benefit of the team.
“I’m really disappointed to share that I won’t be able to compete at the Laver Cup in Berlin next week," Nadal said.
"This is a team competition and to really support Team Europe, I need to do what’s best for them and at this moment there are other players who can help the team deliver the win.
"I have so many great, emotional memories from playing in the Laver Cup, and I was really looking forward to being with my teammates and with Bjorn in his final year as Captain.
"I wish Team Europe the very best of luck and will be cheering them on from afar.”
The news will accelerate speculation that retirement could be imminent for the Spaniard, who was unsure of his future following his exit from the Olympic Games.
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