Factbox on Carlos Alcaraz, who beat Serbian fourth seed Novak Djokovic to win his first Australian Open title on Sunday, increasing his overall Grand Slam tally to seven.
The 32-year-old debutant at the ATP's blue riband event won the first 11 games of the round-robin clash before a relieved Nishikori finally got on the scoreboard with an angled winner.
India No. 1 Sumit Nagal exited the Chennai Open ATP Challenger after a three-set defeat to Russia's Petr Bar Biryukov in the second round.
Jannik Sinner beat Felix Auger-Aliassime to win the Paris Masters for the first time on Sunday.
Stefanos Tsitsipas confirmed his meteoric rise into the highest echelon of men's tennis by battling back to beat Austrian Dominic Thiem 6-7(6) 6-2 7-6(4) in a compelling title duel at the ATP Finals on Sunday.
However, the 33-year-old Spaniard will not know until later on Friday whether his Herculean effort was in vain.
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.
Medvedev became only the fourth player in ATP history to beat the world's top three at the same tournament.
Ronaldo got involved in ball kid duties while watching world number one Novak Djokovic's opening match against John Isner of America as the tennis ball bounced into the stands near the first row where he was sitting.
Muguruza wins all-Spanish clash with Badosa at WTA Finals
United States President Donald John Trump signs the funding bill to end the US government shutdown at the White House, November 12, 2025
While off-court battles over pay and governance rumbled on, opportunities were scarce beyond the duopoly at the top of the men's game, leaving Djokovic to provide the year's standout moments for the chasing pack.
Roger Federer got back on track at the ATP Finals with a 7-6(2), 6-3 defeat of Italian Matteo Berrettini on Tuesday.
The 36-year-old was given a thorough workout by Sock although had he been a little more clinical the scoreline would have been more heavily-weighted in his favour.
Only once in 16 previous appearances has Federer not survived the group stage, back in 2008. IMAGES from the ATP Finals played at The O2 Arena in London on Sunday
Not that cash will be the motivator for world number one Novak Djokovic, Rafa Nadal, Dominic Thiem, Tsitsipas, Daniil Medvedev, Alexander Zverev and debutants Andrey Rublev and Diego Schwartzman when the tournament's 50th edition starts on Sunday.
Alexander Zverev fumes after Carlos Alcaraz takes a medical timeout for cramps during their Australian Open semi-final, questioning rules and alleged preferential treatment.
Jannik Sinner was in ominous form on the Rod Laver Arena court he has ruled for two years before the match was cut short.
Grigor Dimitrov claimed the biggest title of his career and sent out a huge statement of intent as the stylish Bulgarian beat David Goffin 7-5, 4-6, 6-3 to win the ATP Finals.
Just nine days after his loss to Fritz, which snapped his 13-match unbeaten streak, the world number one defeated the American 6-4, 6-4 in straight sets, capping an incredible debut at the ATP 500 event and securing his career-best 67th season win, continuing a dream season.
Sinner has a perfect 10-0 record against de Minaur, and he is currently number two in the ATP Live Race to Turin, having qualified for the season-ending ATP Finals. Sinner has reached the last four in seven out of his previous eight tournaments this year.
Tsitsipas had lost all five previous matches against the Russian, but turned the tables in impressive fashion.
Having dug in early on to stay with Federer, Nishikori ended up running away with the match to inflict a first straight sets defeat in the ATP Finals round-robin stages on the 20-time Grand Slam champion.
World number one Novak Djokovic began his quest for a sixth title at the season-ending ATP Finals with a 7-6(4), 6-2 victory over Norway's Casper Ruud in their round robin encounter in Turin on Monday.
India takes on the Netherlands in the Davis Cup Qualifier, relying on faster playing conditions and the return of Yuki Bhambri to overcome a depleted Dutch side.
Jannik Sinner has decided not to take part in this year's Davis Cup Finals with reigning champions Italy confirming his absence in Monday's team announcement, while world number one Carlos Alcaraz will represent Spain at next month's competition.
The 20-year-old German, ranked three in the world, was hot and cold against Croatia's Marin Cilic but, when it mattered most, he produced his best tennis to win 6-4, 3-6, 6-4.
World No. 1 Carlos Alcaraz came under extreme pressure before overcoming American Taylor Fritz 6-7(2), 7-5, 6-3 in a thrilling round-robin match at the ATP Finals on Tuesday, leaving the Spaniard on two wins from two.
Sinner will face 19-year-old Learner Tien for the title.
Novak Djokovic, who is eyeing a record 25th Grand Slam title, looks likely to need to beat either Jannik Sinner and Carlos Alcaraz or both at the business end of the Australian Open.
The victory saw him move up by three places to stand only behind Spain's Rafael Nadal and Swiss star Roger Federer.
Cousins Valentin Vacherot and Arthur Rinderknech will meet in the Shanghai Masters final after pulling off stunning upsets of former champions Novak Djokovic and Daniil Medvedev in the semifinals on Saturday.
Alexander Zverev became the first German to reach the last four at the ATP Finals for 15 years as he beat American John Isner 7-6(5), 6-3 at the O2 Arena on Friday.
Roger Federer rediscovered his verve in the nick of time to outclass Austrian Dominic Thiem 6-2, 6-3, on Tuesday, and maintain his hopes of reaching the last four at the ATP Finals.
The Indo-Japanese wild card pair displayed remarkable grit to upset Harrison and King 4-6, 6-3, 18-16 in a match that kept the crowd on the edge of their seats.
MERTENS OVERPOWERS RUSE TO WIN FIRST GRASS TITLE
Carlos Alcaraz beat his great rival Jannik Sinner 7-5, 7-6(8) to win their Hyundai Card Super Match exhibition event in Incheon, South Korea, on Saturday that marked the start of the season for the world's top two men's tennis players.
Jannik Sinner beat defending champion and Spanish second seed Carlos Alcaraz to win his first Wimbledon title.
Stanislas Wawrinka will hang up his racquet at the end of 2026, the three-times Grand Slam champion announced on Friday, bringing down the curtain on a 24-year professional career that saw him gatecrash tennis's elite during the sport's golden era.
Niki Poonacha earns Grand Slam debut, wins Australian Open wild card play-off with Thai partner
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