The parade of serial grand slam champions is reserved for Tuesday at the ATP World Tour Finals but the supporting cast provided compelling opening acts with Stanislas Wawrinka and Juan Martin del Potro in the spotlight.
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.
American twins Bob and Mike Bryan underlined their status as the best doubles pair in the world as they claimed the ATP Tour Finals title for the fourth time on Sunday.
Richard Gasquet kept his ATP World Tour finals hopes alive when he overcame Fernando Verdasco 7-5, 6-7(6), 6-3 to reach the Paris Masters third round as fellow Frenchman Jo-Wilfried Tsonga crashed out of the race on Tuesday.
Novak Djokovic said he is hoping to put the cherry on top of a successful 2023 season with a record seventh ATP Finals title, after the world number one beat Carlos Alcaraz in the semi-final to set up a showdown with Jannik Sinner.
Poland's Hurkacz was a force to reckon with on serve -- firing 24 aces in the match -- but he ran out of steam in the final set
The event comes at a time when tennis is facing criticism over its relentless tour schedule.
Niki Poonacha earns Grand Slam debut, wins Australian Open wild card play-off with Thai partner
A razor-sharp Roger Federer got back to winning ways at the ATP World Tour Finals with a 6-4, 6-3 defeat of Frenchman Richard Gasquet on Thursday to keep his last-four chances alive.
For 15 minutes Novak Djokovic appeared to have a fight on his hands at the ATP World Tour Finals on Wednesday, then the Serb dialled up his A game and tore Stanislas Wawrinka to pieces.
Spain's David Ferrer stunned World No. 1 Novak Djokovic to reach the ATP World Tour semi-finals on Wednesday, outplaying the Serb 6-3, 6-1 at the O2 Arena.
He also overtook his career-best 65-season win tally of 2023 with this win.
Down's syndrome can cause developmental delays, intellectual disability and increase the risk for some medical issues in individuals who have the condition.
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.
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.
Third seeds Leander Paes and Radek Stepanek qualified for the semi-finals of the ATP World Tour Finals after winning their second Group A match on Thursday. The Indo-Czech pair beat sixth seeds Marcel Granollers and Marc Lopez of Spain 7-5, 6-4 in 92 minutes.
Novak Djokovic battled from a set down to clinch his 100th tour-level title by beating Polish sixth seed Hubert Hurkacz 5-7, 7-6(2), 7-6(2) at the Geneva Open on Saturday.
Even though he withdrew from his semi-final tie with Denis Shapovalov, Nadal's run to the last four in Paris saw him reclaim the number one spot from Novak Djokovic on Monday.
Zverev and Shelton tested each other in a high-quality encounter before the world number three played a near flawless tiebreak to clinch the match in little over two hours and stretch his career win-loss record over the American to 3-0.
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.
Rafael Nadal refused to let a good old-fashioned beating at the hands of fierce rival Novak Djokovic on Monday take the gloss off a sensational year.
Medvedev outlasts Zverev to reach Halle final
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.
Alexander Zverev rallied from a set down to beat defending champion Alexei Popyrin in Toronto and move into the semi-finals.
Top seed and defending champion Jannik Sinner, playing on his 24th birthday, ended French qualifier Terence Atmane's dream run at the Cincinnati Open with a 7-6(4), 6-2 win on Saturday to reach the final of the US Open tune-up event.
The match marked world number two Medvedev's ninth win in a row at the ATP Finals and he improved his head-to-head record over Ruud to 3-0.
Rohan Bopanna and his Australian partner Matthew Ebden sailed into the men's doubles final at the Miami Open.
Medvedev became only the fourth player in ATP history to beat the world's top three at the same tournament.
The immaculate Serb became the first player in the Tour Finals' 46-year history to claim the title four times in a row
Roger Federer booked his place in the ATP World Tour Finals for a record-tying 12th consecutive year when he dismissed South African Kevin Anderson 6-4, 6-4 to reach the third round of the Paris Masters on Wednesday.
The 25-year-old Dzumhur recovered from a poor start to beat the Briton 1-6, 7-5, 6-3 and will bid to become the Balkan nation's first Tour winner in Saturday's title-decider against Spain's Roberto Bautista Agut.
Bob and Mike Bryan thrashed French duo Julien Benneteau and Edouard Roger-Vasselin 6-0, 6-3 to reach the final of the ATP World Tour Finals on Saturday.
Marin Cilic's debut appearance at the ATP World Tour Finals is fast turning into a nightmare after his second consecutive drubbing at the O2 Arena on Wednesday.
The ATP said that penalties and fines would apply for abuse or misuse of the coaching conditions and that the trial will be assessed at the end of the 2022 season for potential inclusion in future.
Japan Open: Alcaraz marches into quarterfinals, hails "best physio in the world" after overcoming ankle issues
However, the 33-year-old Spaniard will not know until later on Friday whether his Herculean effort was in vain.
Rajeshwaran shown the door at Mumbai Open
'My dad is trying to retire me for a while now ...
The buzz around talented teenagers Mirra Andreeva and Joao Fonseca continued at Indian Wells on Wednesday.
Frenchman Jo-Wilfried Tsonga saved a matchpoint before beating world number six Tomas Berdych 3-6, 7-6, 6-4 in the Marseille Open final to claim his 10th ATP Tour title on Sunday.
