Southampton leapfrogged Manchester United to go third in the Premier League after a 1-0 win at Old Trafford.
Dusan Tadic was on hand to slot home past Tyler Blackett into an empty net after Graziano Pelle had struck a post when one-on-one with David De Gea.
The win saw the Ronald Koeman emerge victorious in his second clash with compatriot Louis Van Gaal as the Saints cemented their claims for a Champions League place this season.
Even first half
Southampton showed they were not overawed by their trip to Old Trafford and started the game strongly with Nathaniel Clyne firing just wide in his return to the team following injury.
Toby Alderweireld was then replaced by Florin Gardos as he overstretched for a through ball, and the substitute made a fine block to deny Robin van Persie just before half time.
The home side did have another chance just before the break, but Angel Di Maria fired wide on the turn, maybe showing signs of rust after his recent injury.
Tadic the difference
Southampton took the lead with twenty minutes to go, and just five minutes after Tadic was brought on to replace debutant Eljero Elia.
After good work by Graziano Pelle to keep the ball in the final third, James Ward-Prowse found Tadic on the edge of the box.
He cleverly laid the ball to Pelle again and his shot struck the post having beaten David De Gea. The rebound fell kindly to the Serbian who side-footed the ball past Tyler Blackett and into the net.
Strong at the back
Juan Mata had three good chances for Louis Van Gaal's side with the game entering the final ten minutes.
First he fired past the post after Fraser Forster could only tip Daley Blind's cross into his path, and the second was a better chance but he put the ball over from six yards out.
The last again went wide from Antonio Valencia's cross as the Southampton defense stood firm with captain Jose Fonte leading by example.
Top four chances
The win leaves the Saints with a superb opportunity to finish in the Champions League places this season.
Their previous three matches have seen them face Chelsea, Arsenal and United and they have come away with two wins and a draw which will give them confidence going into the latter stage of the season.
They will now not be scared to face anybody in the Premier League and with the confidence his side now has, Ronald Koeman will definitely be quietly confident of achieving just that.
Southampton player ratings
Forster - 6
Clyne - 7
Fonte - 9
Alderweireld - 7
Bertrand - 6
Wanyama - 8
Schneiderlin - 8Ward-Prowse - 7
Davis - 7
Elia - 7
Pelle - 7
Gardos - 8
Tadic - 8
Reed - NA