Greenwood was the Reds' matchwinning hero against Brighton as United came from behind at Old Trafford in the Premier League to beat the Seagulls 2-1.
Ex-Red Danny Welbeck had opened the scoring for the visitors in the first half, but United hit back with second-half goals from Marcus Rashford and Greenwood, who headed home the 83rd-minute winner.
It was his second goal in successive matches having scored our goal at Leicester City in the FA Cup quarter-final defeat before the international break.
The 19-year-old’s previous Premier League goal came back in the first week of December at West Ham and it was only his sixth following his 17 goals in his first full season during 2019/20.