Paddy McNair came on for Sunderland in the 83rd minute of their game against Manchester City, David Moyes having given him one responsibility - don’t let City score.
In the 87th minute, McNair scored an own goal that gifted City three points and Pep Guardiola a successful start to the Premier League.
Given that McNair joined Sunderland from Manchester United on Thursday, it gave City fans an added sense of joy.
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Sunderland were all set to spoil the party, Jermain Defoe wiping out Sergio Aguero’s third-minute opener in the second half.
But McNair had a debut to forget, handing City the win in truly devastating style.
There was little he could do about his own goal, heading the ball into the gaping net after Jesus Navas’ cross was flicked up by Kelechi Iheanacho.
Watch the goal below.
City fans troll Mourinho
Jose Mourinho’s decision to sell McNair for £5.5 million was met with despair by those who are afraid the United boss won’t give youth players a chance.
But after McNair’s mishap, some United fans realise Mourinho might have made the right call where the centre-back is concerned.
Yet it hasn't stopped City supporters from trolling the Portuguese for selling the defender two days before he gave Guardiola three points.
If Guardiola didn’t realise how difficult it would be to succeed in England, he does now. The Catalan enjoyed great success at Barcelona and Bayern Munich but City were pushed right to the end by a team who finished 17th last season.
Yet three minutes into the game, he would have been wondering what all the fuss was about. Raheem Sterling was fouled inside the box and up stepped Aguero to smash the ball home.
Despite dominating possession, the Citizens were unable to double their lead and were made to pay when Defoe found a yard inside the box and slotted past Willy Caballero.
Eventually, Guardiola’s blushes were spared. But it wasn’t easy.