United tasted victory away from home for the first time since March’s remarkable Champions League triumph at Paris Saint-Germain by digging deep on a difficult night in Serbia.
Partizan pushed to the death, backed by a raucous home support, but Anthony Martial’s first-half spot-kick proved enough as United came through Thursday’s Europa League clash with a hard-fought 1-0 win.
Martial scored the match-winning goal but it was Williams who got the lion’s share of the praise, with the 19-year-old bursting into the box and drawing the game-defining penalty.