Defending US Open champion Novak Djokovic suffered a shock exit at Flushing Meadows as he lost in four sets to Alexei Popyrin.
Djokovic arrived at the tournament with confidence following his gold medal triumph at the Paris Olympics, and was tipped to lift a record-extending 25th grand slam title.
However, the Serbian's hopes of a fifth success in New York were dashed as he followed fellow favourite Carlos Alcaraz out of the competition in the third round.
Popyrin emerged victorious in three hours and 18 minutes, prevailing 6-4 6-4 2-6 6-4 to confirm Djokovic's earliest exit from the tournament in 18 years.
"I have played some of the worst tennis I have ever played," Djokovic said.
"Honestly, the way I felt and the way I played from the beginning of this tournament, third round is a success."
"I tried my best, I didn't have any physical issues. I just felt out of gas, and you could see that. From the first match, I just didn't find myself on this court.
"Life moves on. I'll try to recalibrate and look forward to what's next."
Data Debrief: Another one bites the dust
Djokovic was far from his clinical best, serving a career-high 14 double faults in a grand slam match and committing 49 unforced errors.
The Serbian will also end the year without winning a grand slam title, the first time he has done so since 2017.
But the day belonged to Popyrin, saving 12 of the 16 break points he faced against the world number two, finding particular success with his forehand as 31 of his 49 winners came from that shot.
Sinner and Berrettini send defending champions Italy into Davis Cup final
Jannik Sinner's victory over Alex de Minaur clinched Italy's place in another Davis Cup final, with Matteo Berrettini also victorious as the defending champions beat Australia 2-0.
Italy won the Davis Cup for the first time since 1976 last year, and they will have an opportunity to defend their crown against the Netherlands on Sunday.
Former Wimbledon finalist Berrettini got the ball rolling with an entertaining 6-7 (6-8) 6-3 7-5 victory over Thanasi Kokkinakis, not surrendering a break after losing the opener in a tie-break.
That teed up Sinner to close out Italy's victory, with the world number one overcoming De Minaur 6-3 6-4, the same scoreline he beat the Australian by at the ATP Finals earlier this month.
Speaking after his victory in Malaga, Sinner said: "It means a lot. It was a tough encounter, playing Alex. We know each other quite well now, so I have to be very careful every time.
"It's a very tough challenge for me, so I was looking forward to this one. Obviously, it helped a lot that Matteo won the singles today. He played amazing tennis. It was very high quality.
"Hopefully, this can give us some confidence for [Sunday]. It's going to be a very difficult and tough day for us and also the Netherlands."
Data Debrief: Back-to-back for Italy
Italy's men are looking to follow in the footsteps of their female counterparts, who won the Billie Jean King Cup earlier this week.
They are just the third nation in history to make back-to-back finals at both the Davis Cup and the Federation/Billie Jean King Cup, after the United States (1963-64, 1978-79, 1981-82 and 1990-91) and Australia (1963-64 and 1964-65).
Djokovic appoints Murray as coach for Australian Open
Novak Djokovic has announced his long-term former rival Andy Murray as his coach for the Australian Open in 2025.
Murray, a three-time Grand Slam winner, announced his retirement earlier this year and played his final match at the Paris Olympics in August.
He will join Djokovic's team in the off-season and coach him through the opening grand slam of the year, which begins on January 12.
This will be Murray's first coaching role since retiring following a 19-year career.
"We played each other since we were boys. 25 years of being rivals, of pushing each other beyond our limits," Djokovic said in a video on social media.
"We had some of the most epic battles in our sport. They called us game changers, risk-takers, history makers.
"I thought our story may be over - turns out it has one final chapter.
"It's time for one of my toughest opponents to step into my corner. Welcome onboard coach, Andy Murray."
Djokovic failed to win a major title for the first time since 2017, though he did clinch a long-awaited Olympic gold medal in Paris.
The Serb is currently level with Margaret Court for the most major singles titles by any player. He has a good record in Australia though, winning 10 times in Melbourne, beating Murray in four of those finals.
Murray, who beat Djokovic to win the US Open title in 2012 and Wimbledon the following year, says he hopes they can achieve success together.
"I'm going to be joining Novak's team in the off-season, helping him to prepare for the Australian Open," Murray said.
"I'm really excited for it and looking forward to spending time on the same side of the net as Novak for a change, helping him to achieve his goals."
Griekspoor heroics send the Netherlands to historic Davis Cup final
Tallon Griekspoor produced a thrilling comeback to help the Netherlands reach the Davis Cup final for the very first time after they downed Germany 2-0 in Malaga.
After losing the opening set to Jan-Lennard Struff, Griekspoor held his nerve to emerge a 4-6 (4-7) 7-5 6-4 victor on an enthralling day of action on Friday.
Earlier in the day, Botic van de Zandschulp, who beat Rafael Nadal in the final match of the Spaniard's career on Tuesday, put the Dutch 1-0 up with a win over Daniel Altmaier.
The world number 80 needed 10 match points to wrap up a tense 6-4 6-7 (12-14) 6-3 victory, after Altmaier saved five break points in a second set tie-break.
Griekspoor then stopped the best-of-three tie from going to the deciding doubles, rallying back with a fine display, though Struff let two crucial break points slip in the eighth game of the second set.
“We have been talking about this [moment] for two or three years,” said Griekspoor.
“We came here all the time with unbelievably tough draws, but we believed in ourselves so much. We always felt like this was possible.
"To do it now feels unbelievable. I am so happy for the team, and for Holland.
“I just tried to focus on my own game. I felt like he was playing unbelievable tennis, I didn’t do much wrong in the first set.
"I’m super proud of myself, super proud of the effort and very happy to get the win in the end.”
The Netherlands await either reigning Davis Cup champions Italy or Australia, who face off in the other semi-final on Saturday.
Data Debrief: Dutch delight
After reaching the semi-final stage for only the second time this century, the Netherlands produced arguably their finest display of the tournament against Germany.
It meant that after 185 ties played at the event across a 104-year timeframe, they had finally reached the showpiece match at the tournament for the first time.
But their victory was made possible by Griekspoor, who converted both his break points, while fittingly sealing his encounter with his 25th ace of the contest.
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