Half-time substitute Edinson Cavani scored twice in the final 15 minutes to give Manchester United a 3-2 win at Southampton despite being 2-0 down at the break.
The Saints took a shock two-goal lead at the interval following two pieces of genius from James Ward-Prowse. The midfielder's corner found Jan Bednarek for a close-range finish before Ward-Prowse hit a delightful free-kick just before the break.
At half-time, Ole Gunnar Solskjaer brought on Cavani and Dean Henderson for Mason Greenwood and David De Gea - who picked up a knee injury - and the outfield change was pivotal in the second period.