* Mourinho suffers third defeat in a row
* Capoue scores fourth goal in five games since joining Watford
* Rashford equalises but Watford score two late goals
* United's next match is Northampton in EFL Cup on Wednesday
WATFORD 3 MANCHESTER UNITED 1
Sept 18 Manchester United suffered their third defeat in eight days as Watford handed Jose Mourinho his worst run as a manager in a decade.
Goals from Etienne Capoue, Juan Zuniga and a late penalty from Troy Deeney overwhelmed the visitors, who had levelled with a solitary strike from Marcus Rashford.
For all their possession, United were unsettled by Watford's harrying game and went behind on 32 minutes after Anthony Martial, still groggy from an earlier clash of heads, was robbed by Miguel Britos.
Daryl Janmaat picked up the ball and crossed for Capoue to fire his fourth goal of the season.
A half-time switch, which pushed Wayne Rooney further forward, settled United and they equalised on 62 minutes when Rashford scrambled the ball home after his header bounced back to him off a defender.
Watford keeper Heurelho Gomes denied Zlatan Ibrahimovic with a flying save but United always looked vulnerable and Zuniga scored from a cutback by Roberto Pereyra less than a minute after coming on.
Zuniga was then brought down by Marouane Fellaini inside the area late on to allow Deeney to score from the spot. (Reporting by Neil Robinson, editing by Alan Baldwin)