Canada's Felix Auger-Aliassime came from a set down to earn his first victory at this year's ATP Finals in Turin with a 4-6, 7-6(7), 7-5 win over American Ben Shelton on Wednesday.
After a gutsy performance that pushed Sinner to four sets, the Italian world number one ultimately proved too strong. Yet the Canadian said he would carry plenty of positives forward from Flushing Meadows.
Daniil Medvedev was awarded the Dubai Tennis Championships title after his opponent Tallon Griekspoor withdrew due to an injury he suffered in the semi-finals.
But Ruud, a semi-finalist last year, stamped his authority in the tiebreak and did not face a single break point in the match as he beat the Canadian for the second time this year.
Auger-Aliassime was a step up for Federer who was far from his best in an error-strewn display.
Canadian Felix Auger-Aliassime proved too strong for former champion Andy Murray, cutting short the Briton's Grand Slam comeback at the US Open with a breezy 6-2, 6-3, 6-4 victory in the second round on Thursday.
Top seed Alexander Zverev bagged his first ATP crown of the year after beating Canada's Felix Auger-Aliassime 6-3, 6-3 to lift the bett1HULKS Indoor title in Cologne on Sunday.
World number one Carlos Alcaraz eased to a 6-2, 6-4 win over Canada's Felix Auger-Aliassime at the ATP Finals on Saturday to set up a highly-anticipated title decider with defending champion Jannik Sinner.
It was third time lucky for Tsitsipas who had twice lost in the Dubai final, against Roger Federer in 2019 and Novak Djokovic a year later.
Jannik Sinner began his bid to retain the ATP Finals title with a resounding 7-5, 6-1 win over injury-hit Canadian Felix Auger-Aliassime in their round-robin clash.
The World No 1, who extended his hardcourt winning streak to 26 matches, will play against Canada's Felix Auger-Aliassime in the semi-finals.
Canada's Felix Auger-Aliassime reached the last four of the ATP Finals with a 6-4, 7-6(4) round-robin win over two-times winner Alexander Zverev on Friday and Jannik Sinner extended his indoor hardcourt unbeaten run by beating American Ben Shelton.
The opening Grand Slam of the year begins at Melbourne Park on Sunday.
Rublev came into the tournament on a four-match losing streak, but has eased into the final, knocking out second seed Carlos Alcaraz on the way, and will face unseeded Canadian Auger-Aliassime for the title on Sunday.
Felix has gone past the opening round of a major for the first time since the 2023 Australian Open.
Images from the men's singles fourth round matches at the Australian Open, on Sunday.
Jannik Sinner beat Felix Auger-Aliassime to win the Paris Masters for the first time on Sunday.
Jannik Sinner and Carlos Alcaraz are poised to reignite their rivalry at the ATP Finals, with the year-ending championship that begins on Sunday expected to produce another title showdown between the pair in a season that has belonged to them.
Players struggled with cramp and injuries on the second day of the Australian Open on Monday, headlined by the retirement of seventh seed Felix Auger-Aliassime while his compatriot Marina Stakusic needed a wheelchair to leave the court.
Andrey Rublev reached the final of the Qatar Open on Friday with a 7-5, 4-6, 7-6(5) win over Canada's Felix Auger-Aliassime, and will meet Jack Draper in the decider after the Briton beat Czech Jiri Lehecka.
Defending US Open champion Jannik Sinner continued his stellar run at the hardcourt Grand Slams with a 6-1, 6-1, 6-1 hammering of Kazakh 23rd seed Alexander Bublik on Monday to make the quarter-finals at Flushing Meadows.
Defending champion Jannik Sinner stormed to a 7-5, 6-2 victory over Alex de Minaur in the last four of the ATP Finals on Saturday, as the Australian suffered his 13th straight loss to the four-time Grand Slam winner despite a fighting start.
World number two Jannik Sinner survived a stern test from Joao Fonseca on Tuesday to reach the Indian Wells quarter-finals.
Defending champion Jannik Sinner reached the semi-finals of the ATP Finals with a 6-4, 6-3 win over two-times winner Alexander Zverev on Wednesday, with Ben Shelton eliminated after losing earlier to Felix Auger-Aliassime in the same group.
Carlos Alcaraz would rather win his first Australian Open than retain his French Open and US Open titles next year, the Spaniard said on Friday, a day after sealing the year-end world number one ranking at the ATP Finals.
Novak Djokovic said the shortness and timing of Jannik Sinner's ban this year for an inadvertent doping violation was "odd" and the case would hang over the four-time Grand Slam champion like a cloud for the rest of his career.
Defending champion Jannik Sinner swept past Felix Auger-Aliassime 6-0, 6-2 on Thursday to reach the Cincinnati Open semi-finals, the world number one extending his hardcourt winning streak to 25 matches.
Defending champion Carlos Alcaraz moved into the fourth round at Indian Wells on Sunday with a 6-2 6-3 win over Felix Auger-Aliassime.
Canada are close to securing a place in the Davis Cup final Eight after a commanding 3-0 victory over Finland while Australia cruised to a 3-0 victory over the Czech Republic
Jannik Sinner had to dig deep to get the better of Auger-Aliassime in the second semi-final.
Shelton was broken in the opening and closing games of the first set, unable to take advantage of a break point at 2-1 down while Sinner was always capable of pulling out an ace at the crucial time, hitting two in that fourth game to hold serve.
Top seed Novak Djokovic beat Canadian Felix Auger-Aliassime 7-5, 7-6(1) to reach the semi-finals of the Italian Open on Friday and move within one win of 1,000 career victories.
Serbia's Novak Djokovic beat Italy's Lorenzo Musetti 6-4 6-2 to reach his first Olympic final on Friday and will bid for gold in a blockbuster clash with Carlos Alcaraz.
Images from the US Open matches played at Flushing Meadows on Saturday
Coco Gauff started her quest for a maiden Australian Open title with a straight games win over Kamilla Rakhimova to reach the second round.
Medvedev in Shanghai semis as Rinderknech joins cousin Vacherot in last four
Jannik Sinner and Carlos Alcaraz are among the world's top players calling for the Davis Cup to return to its traditional home-and-away format and be staged over two years, a proposal backed by ATP chairman Andrea Gaudenzi.
US Open champion Carlos Alcaraz crashed to defeat on his debut as world number one, losing to Canada's Felix Auger-Aliassime in their Davis Cup Finals group-stage clash on Friday.
The 38-year-old said he had been dealing with the injury throughout the tournament in Athens.
Lehecka struck eight aces and converted four of eight break chances to secure the first Top 3 win of his career.