Watford moved a step closer to an immediate return to the Premier League with victory at already promoted Norwich City.
Norwich keeper Tim Krul made three good saves in the first half, keeping out an angled shot from Ismaila Sarr with his legs and then pulling off a double stop to claw away Ken Sema's low effort and deny the Senegal winger on the follow-up.
Dan Gosling broke the deadlock and put the Hornets ahead when he converted Joao Pedro's low ball into the middle 12 minutes after the restart.
The Canaries, who could have clinched the Championship title with victory at Carrow Road, struggled to create chances but Mario Vrancic shot straight at visiting keeper Daniel Bachmann deep into second-half stoppage time.