Daniil Medvedev denied Novak Djokovic a 21st consecutive win to set up an all-Russian final against Andrey Rublev at the Dubai Tennis Championships.
Djokovic had started 2023 by coming out on top in all 15 of his matches and winning the Australian Open, with his overall winning streak standing at 20 games.
But Medvedev ended the world number one's perfect start to the year with a superb display to take a 6-4 6-4 triumph on Friday.
The 27-year-old, who himself made it 13 consecutive wins, broke Djokovic twice on the way to taking the opening set.
Medvedev's high standard of play continued in the second, breaking Djokovic in the first game before holding in all five of his service games to secure a straight-sets victory.
"When you play against Novak you just have to play your best," Medvedev said after the win. "Kind of hope he doesn't play his best on the day because when he plays his best, well he has 22 grand slams, so even if you play your best, it is going to be tough, not sure you win.
"I managed to play a higher level than him today. In the second set I didn't face one break point, but there were so many 30-30 games. But I managed to stay composed and I am happy to be in the final tomorrow."
His win means he will face countryman Rublev in the final after the reigning champion kept his hopes of retaining the title alive with a 6-3 7-6 (11-9) success over Alexander Zverev.
Rublev had never previously won a match or set against Zverev in five previous meetings, but won three of the German's service games in the opener to go a set ahead.
The second seed was out-aced nine to two in the second set but managed to force a tie-break, going on to survive a set point before eventually securing the win on his sixth match point.
Rublev will look to join Roger Federer and Djokovic as only the third repeat champion at the tournament when he takes on Medvedev in Saturday's final.
The compatriots have met six times previously with Medvedev winning four of them, though Rublev has taken victory in their last two match-ups.
Murray knocked out of Geneva Open as Hanfmann books Djokovic clash
Andy Murray was denied a meeting with Novak Djokovic at the Geneva Open as Yannick Hanfmann completed a 7-5 6-2 win over the Scot on Tuesday.
Murray's first-round clash with Hanfmann was suspended due to rain on Monday, with the three-time grand slam champion 7-5 4-1 down.
He had earlier fumed at umpire Greg Allensworth as pollen rained down on the court in Switzerland, questioning why play had not been stopped.
The rain may have frustrated Hanfmann's victory pursuit on Monday, but it only provided a temporary reprieve for Murray as the players returned to complete the match the next day.
Hanfmann held his nerve through his final two service games to book a meeting with Djokovic for Wednesday.
In Tuesday's other early match, four-time grand slam quarter-finalist David Goffin was beaten in straight sets by Nicolas Moreno De Alboran.
The likes of Denis Shapovalov and Tallon Griekspoor are also in action in Switzerland on Tuesday, with Taylor Fritz and Casper Ruud joining Djokovic in entering for the second round on Wednesday.
Murray fumes at umpire amid severe weather at Geneva Open
Andy Murray fumed at the umpire as inclement weather forced his Geneva Open tie with Yannick Hanfmann to be suspended.
Murray's meeting with Hanfmann was postponed with the Scot a set and a double break down, with his German opponent in control at 7-5 4-1.
Former world number one Murray was furious with umpire Greg Allensworth as the weather closed in.
"I know you guys don't play but it'd be good to have a bit of a feel for what's happening," said Murray during a break in play.
"You're fine for us to play when there's s*** flying around?
"It's like it's snowing out here and you still want us to keep going."
Allensworth eventually sent the players into the dressing rooms.
Murray is aiming to use the Geneva Open to prepare for what is set to be his first French Open appearance since 2020.
A tie with Novak Djokovic is on the cards if Murray can turn things around on Tuesday, though it looks incredibly unlikely.
Howe taking plenty of positives despite frustrating Newcastle campaign
Eddie Howe was keen to look at the positives after Newcastle United secured seventh place in the Premier League on Sunday.
Alexander Isak and Bruno Guimaraes were among the goalscorers as Newcastle won 4-2 at Brentford to finish their Premier League campaign.
The victory ensured a seventh-place finish, and a Manchester City victory over Manchester United in next Saturday's FA Cup final will confirm Newcastle's place in next season's Europa Conference League.
While this season did not quite live up to the heroics of last term, which saw the Magpies finish in the Champions League spots, Howe still feels it has been a successful campaign.
"It summed up our season," Howe told BBC Sport. "We weren't totally secure at the back, but great credit to the players. They've done their job - now we wait and see.
"We anticipated after losing against Manchester United that our control of the [European] situation had gone. It's never a nice situation, but whatever happens, happens.
"We have issues to solve defensively. If we can do that, next season could be another season of really strong performances. This was a season that could have been better, but a good season overall.
"We're a really united club. I think we're still moving forward, so there's a lot to be positive about."
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