Graham Cummins' 11th goal of the season helped First Division side Cork pull off a shock at Turner's Cross yesterday.
With extra-time looming large, Frenchman Vincent Escudé-Candau played a sublime through ball to Cummins and last season's top scorer in the second tier turned Evan McMillan inside-out before curling a sumptuous effort into the St Pat's net.
Derek O'Brien had given the home side the lead in the 19th minute with a wonderful strike from 25 yards after man of the match Escudé-Candau had assisted again.
It was a just reward for City as they set about their Premier Division opponents with some brilliant attacking play.
City were very impressive in the opening period and O'Brien was desperately unlucky when his effort was cleared off the line by Ian Bermingham after 43 minutes.
Pat's had equalised early in the second half, Neil Harney scoring with a powerful header from Sean Stewart's pin-point cross, but they couldn't beat Mark McNulty again, with the Leesiders' goalkeeper making a remarkable late double save to deny Dave Mulcahy and Daryl Kavanagh.
Cork City -- McNulty; Mulcahy, Spillane, Kavanagh, Horgan; Morrissey (Turner 86), Duggan, O'Halloran, O'Brien; Escudé-Candau; Cummins.
St Patrick's Athletic -- Bennion; Harney, McMillan, Mulcahy, Bermingham; Crowley (Murphy 87), McFaul (O'Brien 77), Bradley, Stewart (Logan 88); Kavanagh, North.
Ref -- P Sutton (Clare).