Manchester United were punished for their profligacy by Dusan Tadic as the Serb struck late to ensure Southampton a 1-0 win at Old Trafford.
After the hosts had enjoyed the majority of possession in Sunday’s encounter, albeit wasting the scarce few chances they created, Tadic netted 69 minutes in as United lost at home in the Premier League for the first time since the opening day.
The former Twente man calmly sidefooted home from inside the area as Ronald Koeman’s men leapfrogged United into third.
Robin van Persie and Angel di Maria had threatened in a dour first half, but the home side never looked incisive enough to take maximum points.
United flattered to deceive in spells after the break as well, with Tadic on hand to make them pay – slotting home after Graziano Pelle’s effort rebounded off the post.
Koeman – widely documented to have a frosty relationship with opposite number Louis van Gaal following disagreements during their time at Barcelona and Ajax – saw his side avenge their 2-1 defeat when the teams met at St Mary’s Stadium last month.
The injury-enforced withdrawal of Toby Alderweireld was the only low point for the south-coast club, while Van Gaal has work to do to rediscover his side’s finishing touch if they are to regain third place.