Resolution criteria

The ATP Year-End No. 1 is determined as the player who ends the year as world No. 1 in the ATP rankings. Rankings are calculated by totaling points from a player's best eighteen tournaments, including the four Grand Slams, eight mandatory ATP Masters tournaments, and the ATP Finals. Resolution will be based on the official ATP rankings as published on the ATP Tour website (https://www.atptour.com/en/rankings/singles) following the conclusion of the 2026 ATP season.

Background

Jannik Sinner and Carlos Alcaraz are the top contenders for the 2025 year-end No. 1 ranking. The 2026 season will feature similar dynamics, with both players having established themselves as the dominant forces in men's tennis. Jannik Sinner is the current men's singles world No. 1 as of November 2025. The race for year-end honors typically intensifies through the fall, culminating at the ATP Finals in November.

Considerations

Only one player can finish as year-end No. 1. If none of the listed players finishes in the top ranking position, the market will resolve to "Other." The year-end ranking is determined by cumulative points over the entire calendar year, with significant weight given to Grand Slam tournaments and the ATP Finals.

• Update 2025-12-10 (PST) (AI summary of creator comment): The creator has chosen to structure this as a set market (rather than multiple choice) to allow for the possibility of resolving NO at any time during the year if circumstances warrant it, even though only one player can finish as year-end #1.