• Troy Deeney fired the Hornets into an early lead with his 105th Watford goal
• Dušan Tadic and Nathan Redmond put the Saints ahead going into to break
• Stefano Okaka equalised for the Golden Boys with 10 minutes remaining
• Late goals from Manolo Gabbiadini and Redmond seal three points for the Saints
• Abdoulaye Doucouré scores last-gasp consolation for the Hornets
Watford fell to a frustrating defeat to Southampton on Saturday afternoon in the Premier League.
Troy Deeney’s fine early goal was cancelled out by strikes from Dušan Tadic and Nathan Redmond to ensure the visitors went into the break ahead.
The Hornets got back into the game through Stefano Okaka, but quick-fire goals from Manolo Gabbiadini and Redmond secured the points for the Saints, before Doucouré's first-goal for the Hornets came too late.
Walter Mazzarri made two changes to the side that collected a point against West Ham a week previous.
Sebastian Prödl and Okaka both came in for the injured pair of Daryl Janmaat and Mauro Zárate.
The Hornets made an electric start to the game and were ahead with their first effort at goal through captain Deeney.
Strike-partner Okaka knocked the ball back into the box and Deeney curled a stunning first-time curling volley into the far corner.
The Saints reacted well to the early set-back and Gomes was forced to tip a James Ward-Prowse pile-driver wide at his near-post, and save down low to his right to deny Gabbiadini soon after.
The Saints however were back in the game before long after the Hornets failed to clear their lines and the ball fell to Tadić. He made no mistake as he arrowed a low shot into the bottom corner.
Into first-half stoppage time the Hornets were undone by a fine passage of play from the Saints. A ball was whipped across the box from the right and Redmond swept his effort in via the base of the post.
The first real chance of the second-half came after an hour as Gomes was forced to tip Tadić’s dipping half-volley over the bar.
Moments later the shot-stopper pulled off another fine save as he nudged Maya Yoshida’s effort away from a Tadić free-kick.
Mazzarri made his first change of the match as Isaac Success came on for Etienne Capoue for the Hornets.
Forster made a crucial stop with his legs to deny Okaka after the front-man had been slipped in by Tom Cleverley.
The Hornets went close once more as a cross from the left by Holebas was brought down by Deeney. The captain’s shot went just wide.
With their next chance at goal the Hornets were back on level terms. Success drilled a low ball across the face of goal which Okaka buried past Forster with a composed finish.
The Saints restored their lead shortly after in fortuitous circumstances. Sofiane Boufal’s shot was spilled by Gomes into the path of Gabbiadini who gratefully tapped in.
Redmond put the game to bed moments later as he broke into the box and fired a right-footed shot high into the goal via Gomes’ glove.
There was one final Watford goal but it was too little, too late. M’Baye Niang whipped a cross in from the right and via Britos' flick Doucouré tapped in for his first Watford goal.
HORNETS XI: Gomes (GK); Kaboul, Prödl, Britos, Holebas; Cleverley, Behrami, Capoue (Success, 70); Niang; Deeney (c), Okaka (Doucouré, 89).
Subs not used: Arlauskis (GK), Mariappa, Cathcart, Zúñiga, Stewart.
Yellow cards: Okaka (44), Prödl (73)
Goals: Deeney (3), Okaka (80), Doucouré (90)
SAINTS XI: Forster (GK); Cédric, Yoshida, Stephens, Bertrand; Davis (c), Romeu, Ward-Prowse (Boufal, 79); Redmond, Gabbiadini (Long, 84), Tadić (Clasie, 87).
Subs not used: Hassen (GK), Rodriguez, Cáceres, McQueen.
Yellow cards: Cédric (15)
Goals: Tadić (28), Redmond (45, 87), Gabbiadini (83)
Referee: Jon Moss