Southampton had started the brighter of the two teams at Old Trafford and had already gone ahead thanks to a smart finish from Stuart Armstrong.
The visitors were only in the lead for eight minutes, however, as Man United came storming back.
Marcus Rashford had already seen a goal ruled out for offside after he made his move just a split second too early.
He wouldn’t be denied, and just a couple of moments later he was in the right place at the right time to slot the equaliser home in clinical fashion.
Pictures from DAZN
Rashford has had to make do with sharing the limelight recently as Mason Greenwood has become the latest exciting prospect to shine at Old Trafford.
The 18-year-old has burst onto the scene in much the same way Rashford did a few years ago, but the latter has shown his importance to United again this evening with this well-taken equaliser.