Manchester United were left fuming after Adam Johnson was adjudged to have been fouled by Tom Cleverley, which led to Fabio Borini burying the spot-kick for the winner
An own goal from Ryan Giggs just before half-time gave the Black Cats the lead, with Nemanja Vidic heading home a corner to level things early on in the second half.
But disaster struck when Tom Cleverley made a clumsy attempt to tackle substitute Adam Johnson, who went down in the box to win the hosts a penalty. Cue uproar from the Red Devils, but referee Andre Marriner did not change his mind as Fabio Borini slammed home what proved to be the winner.
Manager David Moyes criticised the match officials after the game, while veteran midfielder Ryan Giggs termed the decisions made during the game as "laughable".
But the majority of Goal Singapore readers agreed that the correct call was made, with 63.3% believing that it was indeed a penalty for Sunderland. This is despite replays showing that minimal contact was made, although it can be argued that there was no need for Cleverley to make a challenge in that situation. 36.7% disagreed, voting that it was not a penalty.
The loss follows hot on the heels of a FA Cup exit to Swansea, with a home loss to Tottenham preceding that.
The second leg will be played on the morning of January 22, Singapore time, while United take on Swansea in the league at home this weekend.