Wilson Isidor's composed second-half strike was enough to send Sunderland back to the top of the Championship as they edged out Hull City in controversial fashion.
The French forward led a counter-attack from inside his own half for his third goal in four games as the Black Cats jumped a point above Burnley, who had won at Sheffield Wednesday on Saturday.
But Hull were furious the 63rd-minute strike was allowed to stand after they felt referee Robert Madley got in the way of Marvin Mehlem, causing the German to lose the ball that led to the swift Sunderland break.
Defender Alfie Jones and assistant head coach Julian Hubner were booked for their protests, while head coach Tim Walter was shown a yellow card for approaching the referee at full-time to vent his anger.
Walter's third booking of the season means he will now serve a one-game touchline ban and miss Wednesday's home meeting with second-placed Burnley.
The Tigers, who hit the woodwork through Chris Bedia with the score goalless, remain in 14th after a second consecutive loss.
Both sides were relegated from the Premier League seven years ago and in that time, each dropped into League One but has climbed back to this level.
Ownerships have changed, managers have come and gone but the ambition to return to the top flight is as strong as ever.
They have each started this campaign with bosses unknown to many, but while German Walter has had a mixed start with Hull, Frenchman Regis le Bris has hit the ground running at Sunderland.
That showed, albeit in a very low key first half, as the Black Cats went closer to scoring, with Patrick Roberts having a cross-shot saved by Ivor Pandur's foot and Jobe Bellingham's 20-yard low strike not far past the post.