Belvo fell behind 14 minutes in when Dunne easily converted a close-range penalty. Belvo levelled with a penalty from Danny Riordan four minutes later, but Phil Werahiko’s men were back in the lead thanks to a second Dunne penalty on 22 minutes.
Mary’s added to their tally before the interval when a penalty from the deadly accurate Dunne gave them a 9-3 half-time advantage.
Dunne split the posts with further efforts in the 56th and 63rd minutes. This helped to ease Mary’s back into the game, and even though last year’s champions secured a bonus point with a try from wing Peter Woods (converted brilliantly by Riordan), Mary’s held firm.
Scorers for St Mary’s College: G Dunne 5 pens. Old Belvedere: D Riordan 1 pen, 1 con, P Woods try.
ST MARY’S COLLEGE: G Dunne; D Hudson, S Grissing, M Sexton, C Hogan; P Brophy, M D’Arcy; C McMahon, D Kilbride, Rob Sweeney, G Logan, D Hall, C Ruddock, G Austin, H Hogan.
Replacements: D Fanning for Hogan (46), S Bradshaw for Logan (48), Richard Sweeney for Kilbride (63), Hogan for Brophy (72).
OLD BELVEDERE: D Riordan; P Woods, M McAllister, B Woods, D Mongan; A Wynne, A Sheehan; V Soden, K Buckley, P O’Regan, D Moore, A Trenier, R Leyden, B Smyth, J Conan.
Replacements: B O’Dea for O’Regan (40), J Kennedy for McAllister (40), O’Regan for Soden (50), C Miller for Conan (50), A Dunne for Wynne (54), M Cooney for Buckley (57-73), Conan for Moore (75).
Referee: P Haycock (IRFU).