The 19-year-old, who had scored in each of his two previous domestic games, came off the bench for Marcus Rashford after 72 minutes in north London.
It didn’t take long for our no.11 to register an assist, with a delicious first-time cross for Edinson Cavani to put United ahead, and Mason then helped us finish with a flourish by firing past Hugo Lloris to cap off the scoring with virtually the last kick of the game.
That productive cameo appearance was noteworthy in itself, but stats trending on social media after the game pinpointed just how rare both scoring and assisting as a substitute is, for a player so young.