Jannik Sinner heads to Turin not only as the home favourite, but also as the defending ATP Finals champion.

Sinner also goes into the season-ending tournament as the world number one, having usurped Carlos Alcaraz following his victory at the Paris Masters.

Alcaraz was knocked out by Cameron Norrie in the first round in France, but should the Spaniard win all three of his round-robin matches at the ATP Finals, he will be guaranteed to finish the year as world number one.

It would be richly deserved for Alcaraz, who, after Sinner's year of dominance in 2024, has won eight Tour-level titles this year.

Sinner and Alcaraz have, of course, split the grand slams between them in 2025, with the only major final not to be contested between the standout duo in men's tennis being the Australian Open showpiece match.

Alcaraz and Sinner's rivalry, then, provides the key storyline for this year's ATP Finals, and using Opta insights, we can delve into the intriguing facts and figures ahead of the tournament.

The top dogs

There is a clear gulf in class between Alcaraz and Sinner, and the rest of the ATP Tour, and a thread to keep an eye on in 2026 will be whether any of those players operating in the top 20 can push on to truly compete with the duo on a consistent basis.

Alcaraz has claimed the most match wins of any player at ATP Tour-level overall (67) and at ATP Masters 1000 events (21) in 2025.

And since the US Open’s switch to hard courts in 1978, Alcaraz is the first player to win multiple major titles on all three surfaces before turning 23.

At the age of 22 years and 189 days on Sunday, when the tournament begins, Alcaraz will become the youngest top seed at the ATP Finals since Andy Roddick (21 years, 72 days) in 2003.

No player has reached the final of more Tour-level events this season than Alcaraz (10), and he also leads the way for the most titles (eight). 

In 2024, Sinner became only the third player in the Open Era to win the Australian Open, US Open and ATP Finals in a single season, after Roger Federer (2004, 2006, 2007) and Novak Djokovic (2015, 2023). He was the youngest of the three to achieve the feat.

And while Sinner has not quite scaled the same heights this year, it is worth keeping in mind that his season was put on hold for three months as he served a suspension following the use of a banned substance, albeit in the Italian's case, there was an acceptance from the authorities that there was no intention to cheat the system on his part.

Sinner has still won five titles in 2025, including the Australian Open and Wimbledon. He has reached nine finals, a tally bettered only by Alcaraz. He also became the youngest man in the Open Era to reach the final of all four majors in the same season, and just the fourth player to do so overall, after Rod Laver, Federer and Djokovic.

He also leads the way for wins over top-10 opponents on the Tour, with 14, one more than Alcaraz (13). That record could be particularly useful for the ATP Finals, given the calibre of the opponents he will face.

Sinner and Alcaraz will only be able to meet in the final, and what a fitting end to the season that would be.

Djokovic equalling Federer

Djokovic will be making his 17th appearance at the ATP Finals, equalling Federer (17) for the most appearances of any player at the event since its inauguration in 1970. 

Whether the Serbian will still be around on the Tour to take those records for himself next season, though, remains to be seen.

It has been a strange year for Djokovic, who last won a grand slam title in 2023. The 38-year-old has won two titles this season.

His fist came in Geneva, and that marked his 100th Tour-level victory. His second came on Saturday, as he triumphed over ATP Finals hopeful Lorenzo Musetti in the Athens Open final.

So Djokovic heads to Turin in form, though he has reached only one other final in 2025, losing to Jakub Mensik in Miami, but on the other hand, Djokovic has shown his class by making it to the semi-finals at each of this season's slams, becoming the oldest player to do so.

When he won his record seventh ATP Finals crown two years ago, Djokovic became the oldest player to win the event. He will become the oldest player to feature at the tournament this time around.

Only Federer (10) has reached more showpiece matches at the Tour Finals than Djokovic (nine). 

Djokovic has suggested before that best-of-three sets may be his best and only chance to beat Sinner or Alcaraz. Could that theory be proven correct in Turin?

The other challengers

Sinner will headline the Bjorn Borg Group, which also features Alexander Zverev, Ben Shelton and Felix Auger-Aliassime.

Alcaraz, then, will take on Djokovic, Alex de Minaur and Taylor Fritz, last year's runner-up, in the Jimmy Connors Group.

It All Adds Up To This #NittoATPFinals pic.twitter.com/rF8kAcewSO

— ATP Tour (@atptour) November 7, 2025

Zverev is ranked third in the world, yet he has won only one title in 2025, and the gulf in quality between the German and Sinner has been evident in the matches he has lost to the latter this season, including finals in Vienna and Melbourne.

However, among currently active players, only Djokovic (50) has claimed more career match wins at the ATP Finals than Zverev (17), who will be making his eighth appearance at the event – the most of any player born since the inaugural ATP Tour season in 1990.

In Shelton and Fritz, the United States has multiple representatives at the ATP Finals for the first time since 2006 (Roddick and James Blake).

Meanwhile, only Alcaraz has won more Tour-level matches this year than De Minaur (55).