150 Premier League matches: Manchester United 1 Swans 2
Manchester United 1-2 Swans
Summer signing Gylfi Sigurdsson scored Swansea's winner with just 20 minutes remaining, having also teed up Ki Sung-Yueng's first-half opener before Wayne Rooney acrobatically levelled for United early in the second half.
Ki gave the Swans a shock 28th-minute lead with his first goal for the club, nestling the ball into the bottom corner with a precise finish from 18 yards.
The hosts, led by Louis van Gaal for the first time, were level after the interval as skipper Wayne Rooney fired in from close range.
But Monk's men rallied again and stunned Old Trafford as Sigurdsson saw his effort just cross the line despite the best efforts of David de Gea following Wayne Routledge's cut-back from a Jefferson Montero cross.
After a historic FA Cup victory at this ground last season, Monk's men then celebrated a first ever league win as the final whistle blew.
The Swans then made yet more history in the reverse fixture this season as they completed their first league double over the Red Devils after a 2-1 win at the Liberty Stadium thanks to goals from Ki Sung-Yueng and Bafe Gomis.
SUBS NOT USED: Ben Amos, Recce James, Michael Keane, Shinji Kagawa.
SWANS: Lukasz Fabianski, Angel Rangel, Ashley Williams (capt), Jordi Amat, Neil Taylor (Dwight Tiendalli, 54), Ki Sung-Yueng, Jonjo Shelvey, Wayne Routledge, Nathan Dyer (Jefferson Montero, 66, Gylfi Sigurdsson, Wilfried Bony (Bafetimbi Gomis, 78).
SUBS NOT USED: Gerhard Tremmel, Kyle Bartley, Jazz Richards, Josh Sheehan.
Games that featured in our memorable 150 Premier League matches
Swans 3-0 West Brom (September 2011)
Swans 3-2 Arsenal (January 2012)
Swans 1-0 Man City (March 2012)
Fulham 0-3 Swans (March 2012)
Arsenal 0-2 Swans (December 2012)
Swans 3-0 Cardiff (February 2014)
Newcastle 1-2 Swans (April 2014)
Man Utd 1-2 Swans (August 2014)
Other memorable matches
Liverpool 0-0 Swans (November 2011)
Aston Villa 0-2 Swans (January 2012)
West Brom 1-2 Swans (February 2012)
Swans 1-0 Liverpool (May 2012)