Jannik Sinner wrapped ATP Year-End No. 1 presented by PIF honours in October, but the battle for year-end No. 2 is still up for grabs.
Alexander Zverev enters the Nitto ATP Finals in pole position to finish just behind Sinner. The German holds a 505-point lead over No. 3 Carlos Alcaraz, but the Spaniard still has an opportunity to swap places with the two-time season finale champion.
A player could earn 1,500 points with an undefeated run to the title at the Inalpi Arena, giving Alcaraz a chance to overcome that deficit. Each round-robin win is worth 200 PIF ATP Rankings points, semi-final victories 400 points and a triumph in the final 500 points.
PIF ATP Live Rankings (entering 11 November)
| Player | Points |
| 1) Jannik Sinner | 10,530 |
| 2) Alexander Zverev | 7,315 |
| 3) Carlos Alcaraz | 6,810 |
| 4) Daniil Medvedev | 4,830 |
| 5) Taylor Fritz | 4,500 |
| 6) Novak Djokovic | 3,910 |
| 7) Casper Ruud | 3,855 |
| 8) Andrey Rublev | 3,760 |
| 9) Alex de Minaur | 3,745 |
| 10) Grigor Dimitrov | 3,350 |
Zverev and Alcaraz are both in the John Newcombe Group, so they are guaranteed to meet at least once in Turin. That could prove pivotal in the battle for World No. 2. Alcaraz is trying to finish in the top two for the third consecutive year, while Zverev is attempting to do so for the first time.
Daniil Medvedev is currently live World No. 4, 330 points ahead of No. 5 Taylor Fritz, whose win against the 2020 Nitto ATP Finals champion helped narrow the gap.
Fritz is trying to become the first American to finish in the year-end top four since James Blake was No. 4 in 2006.
Novak Djokovic could fall as low as World No. 9 by the end of Tuesday. The Serbian is live World No. 6 with 3,910 points.
No. 7 Casper Ruud (3,855), No. 8 Andrey Rublev (3,760) and No. 9 Alex de Minaur (3,745) are all within 200 points of them, so they each need just one round-robin win to pass Djokovic.