Sunderland boss Martin O'Neill was bouncing after victory over Manchester City.
Substitute Ji Dong-won made the most of a counter-attack as too many men in blue stood and watched, and the chance to establish a gap over rivals Manchester United evaporated.
There was a suspicion of offside about the goal, although after seeing his side concede a controversial penalty on Boxing Day, O'Neill was delighted to have received the benefit of the doubt.
"It's been an incredible weekend for teams and we are delighted with three points."
Asked if he was delighted, he said: "What do you think? Absolutely, yes. It was just a remarkable performance by the team.
"The roar for the goal was deafening, and I was delighted to hear the roar for the final whistle as well.
"It was a fantastic effort, really, really fantastic." O'Neill said: "They tell me it was marginally offside - marginally, marginally - and we ended up winning the game.
