Blackburn rode their luck on the way to snatching a narrow 1-0 win over a dominant Watford side.
A moment of magic from Rovers' Ryan Hedges on the counter-attack 18 minutes from time decided a game which saw the Hornets on top for long spells.
Matheus Martins twice hit the woodwork for the hosts and Rovers keeper Aynsley Pears produced a string of saves to ensure Blackburn's first clean sheet in 13 away games and first win at Vicarage Road in 22 years.
All four of Watford's Championship goals so far this season came in the opening 43 minutes of their opening day win over QPR.