Alexander Zverev lost his first match as the ATP world number one, falling to Italy's Lorenzo Musetti in straight sets on Wednesday, November 4, 2026.
The German, who ascended to the top ranking this week, was defeated 6-3, 6-4 in the second round of the Paris Masters.
Musetti's victory marks his first win over a reigning world number one and ends Zverev's debut at the summit after just one match.
