A hat-trick from Denis Behan eased Cork City through to the semi-finals of the Ford FAI Cup following this replayed Munster derby victory over Waterford United at Turner’s Cross.
Waterford welcomed back Paul McCarthy to their midfield after suspension to a side that had drawn their three previous matches.
Cork retained Denis Behan who had scored their goal in the 1-1 draw at the RSC on Saturday night, his third goal in two matches, with John O'Flynn starting from the bench.
The visitors created the first chance of the game when Ray Scully cut inside Cork full back Neale Horgan before sending a shot just over Michael Devine's crossbar.
But Cork jumped in front after 11 minutes when Denis Behan thumped a direct free-kick through the Blues defensive wall and into the net off goalkeeper Packie Holden for his fourth goal in three games.
Behan added to that impressive tally ten minutes before the break when he intercepted a poor back pass from Waterford defender Robert Brosnan to Holden, and the striker rolled the ball into an empty
Cork's third goal after 61 minutes guaranteed Damien Richardson's side a place in the last four. A good pass from Colin Healy set up Liam Kearney who drove his shot from inside the penalty area past Holden.
The home side introduced O'Flynn as a late substitute and his first action was to head an effort off the Blues crossbar.
A Dave Warren shot forced a diving save from Devine with ten minutes remaining, but Gareth Cronin's side can now concentrate on staying in the Premier Division.
But there was no stopping Behan who was set up by O'Flynn for his first hat-trick after 84 minjutes.
Cork City: Devine; Horgan, O'Callaghan, Murray, Woods; Farrelly, Gamble, Healy, Kearney; McKenzie, Behan.
Subs: O'Brien for Gamble 67 mins, O'Flynn for McSweeney 74, Softic for Kearney 80.
Waterford United: Holden; Flynn, Brosnan, Breen, Hedderman; Warren; Scully, Kearney, McCarthy, Bermingham; Sullivan.
Subs: Kiely for Kearney 55, Grincell for Bermingham 69 A Mulcahy for Sullivan 78.
Referee: Pat Whelan(Dublin).