Portsmouth stunned Manchester United with a 1-0 victory at Old Trafford on Saturday to reach the FA Cup semi-finals.
The visitors were under siege throughout but a rare break 12 minutes from time ended with Milan Baros being fouled by United keeper Tomasz Kuszczak who was sent off and Sulley Muntari beating stand-in goalie Rio Ferdinand from the penalty spot.
Minutes earlier Portsmouth keeper David James has turned a Patrice Evra shot against the post. United were twice denied by goalline clearances, once when Sylvain Distin made a saving tackle on Michael Carrick and earlier when Glen Johnson headed a Carlos Tevez shot away.
Chelsea travel to Barnsley later on Saturday while in Sunday's quarter-finals, Bristol Rovers take on West Bromwich Albion and Middlesbrough host Cardiff City.