The Limerick outfit, who claimed Senior B hurling honours a week ago, fought back superbly from a four-point deficit late on to sneak past a fancied Patrician Academy side by two points.
Three superb goals from Cappawhite’s Russell Quirke set the tone for the day as the Doon outfit played a clinical counter-attacking game.
Points from Aaron Sheehan and a Ryan Harkin penalty looked to have sealed the win before Doon’s late surge snatched victory.
Scorers for Doon: R Quirke 3-1 (1-0 pen), D Donovan 0-4 (0-3f), P Ryan 0-2, K Hewston 0-1f.
Scorers for Mallow: M Heffernan 0-8 (0-6f), R Harkin 1-1 (1-0 pen), A Sheehan 0-3.
ST FINTAN’S DOON CBS: T Ryan; T Berkley, S Ryan, J Hayes; C Berkley, P Roche, S Ryan; D Stapleton, T Fox; K Hewston, R English, M Dee; P Ryan, D O’Donovan, R Quirke.
MALLOW: P Buckley: N O’Keeffe, L Cronin, J Murphy; E O’Regan, P Herlihy, C Casey; K O’Connor, G Linehan; R Harkin, M Heffernan, A Sheehan; C Crawley, D O’Callaghan, D Clogan. Subs: J O’Hanlon for L Cronin (33), M O’Rourke for D Clogan (43), D Sheahan for C Crawley (48), M Dineen for E O’Regan (48).
Referee: M Meade (Ballylanders).