During this monitoring window, Sinner announced he will miss the rest of the 2026 season due to persistent knee problems, ending his campaign. Unable to defend his ranking points, he will be overtaken by Alexander Zverev, who is 1,280 points behind and will become world No. 1 regardless of his own results, with the earliest possible date being November 2 after the Vienna tournament and the top spot guaranteed by the ATP Finals in Turin. The 29-year-old Zverev would be the first German man since Boris Becker to hold the ranking.
- Sinner announced he will miss the rest of the 2026 season due to persistent knee problems, ending his campaign.
- Zverev is set to become ATP world No. 1 for the first time, with the earliest possible date being November 2 after the Vienna tournament and the top spot guaranteed by the ATP Finals in Turin.
- Zverev, 1,280 points behind Sinner, will overtake him regardless of his own results.
- The 29-year-old Zverev would be the first German man since Boris Becker to hold the ranking.