Wilfried Bony's late winner stole Swansea a 2-1 victory against 10-man Manchester United at Old Trafford and heaped yet more misery on under-fire manager David Moyes.
The striker powered a header past Anders Lindegaard in the 90th minute to send the Swans into the fourth round of the FA Cup. It was United's fifth home loss of the season and their second in succession, following a Premier League defeat to Tottenham at the weekend.
With 10 minutes left, United had substitute Fabio sent off for a reckless tackle on Jose Canas, just minutes after the Brazilian had come off the bench. Swansea made the most of their advantage, and Fabio's immaturity will surely be questioned by Moyes.
United's latest disappointment should not mask the fact Swansea's victory was well deserved. Michael Laudrup's team played with confidence going forward and frequently exposed United at the back.
One such attack saw the visitors go ahead early on, as the impressive Wayne Routledge sprinted clear to chip a fine finish over the head of Lindegaard.
United responded quickly. Alex Buttner found space on the left and swung over a cross so good that Javier Hernandez would have done well to miss. The striker deserved credit for timing his run and his neat left-footed finish did the rest.
The remainder of the first half saw United enjoy the better of possession, but Swansea matched them in all areas and showed signs there was danger to come.
Hernandez missed with a spectacular volley attempt just before the break, but genuine chances were few and far between.
The second half saw Moyes introduce Adnan Januzaj, as United struggled for fluidity going forward. Even with the talented youngster on, however, the home side battled to create clear-cut chances and the game appeared to be drifting towards a draw.
Fabio's sending off then appeared to inject Swansea with the belief it was there to be won. Routledge sped down the left, beating Nemanja Vidic and sending over an inviting cross that Bony emphatically headed home.
There was no meaningful reply from United. Moyes' team slumped to yet another defeat, and the boos rang out at Old Trafford for a manager with the weight of the world—and the legacy of Sir Alex Ferguson—on his shoulders.
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Swansea will face either Birmingham City or Bristol Rovers in the fourth round.
As for Manchester United, they travel to Sunderland next before taking on Swansea at Old Trafford for a second time in seven days on January 11.