---
sport: tennis
date: 2026-09-01
tour: ATP
event: US Open
round: R128
status: FINAL
winner: Monfils
winner_full: Gael Monfils
loser: Vallejo
loser_full: Adolfo Daniel Vallejo
venue: Louis Armstrong Stadium
start: 7:15p ET
end: 9:37p ET
weather: 71 indoor
sets:
  - [2, 6]
  - [6, 1]
  - [6, 2]
  - [6, 0]
---

Monfils d. Vallejo 2-6 6-1 6-2 6-0 in US Open R128 under the Armstrong roof. The wildcard dropped the opener, then flipped the match and ran away with three straight sets, including a bagel in the fourth. Night-session bounce-back for the Frenchman after a slow start.