Manchester United claimed a morale-boosting win to ease the pressure on manager Erik ten Hag as Southampton lost a fourth consecutive game since returning to the Premier League.
United came into the early kick-off needing a result following back-to-back defeats to Brighton and Liverpool and Southampton were handed an early chance to give Ten Hag a further problem when Diogo Dalot fouled 18-year-old winger Tyler Dibling in the penalty area.