Anthony Martial had the pressure of an entire season's success resting on his 20-year-old shoulders when he was played through on goal by a desperation flick from Ander Herrera.
There were 58 seconds of injury time remaining on the clock when Joel Robles dived helplessly to his left and just 57 remaining when the back of the Everton keeper's net rippled.
Martial has a reputation for keeping his cool under pressing situations and he did no harm to that when he calmly slotted the ball home to ensure that extra time at Wembley would not be required.
The sublime finish was Martial's 14th goal in all competitions this season and bold justification of the price tag that many scoffed at towards the end of last summer.
The goal made sure of a vital victory, perhaps the most important of Louis van Gaal's tenure, and resulted in the first United FA Cup win at Wembley this century.
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