Wasteful Cavan slumped to their second successive defeat in the freezing fog at Kingspan/Breffni Park, where Lee McQuaid's last-minute goal helped make it two wins from two for St Mary's.
Scorers -- St Mary's UC: K Niblock 0-6 (6fs), L McQuaid 1-0, P McAleer 0-2, D Carson, M Pollack, M Beegan, K Mossy 0-1. Cavan: G Smith 1-4, M Cahill, B Fitzpatrick, D Thomas, M McKeever 0-1.
St Mary's UC -- T Harney; M Slane, K O'Boyle, M Digney; C Campbell, B Canavan, B Og Maguire; J Kelly, M McKenna; O McIvor, K Mossey, M Began ; M Pollock, K Niblock, P McAleer. Subs: L McQuaid for O McIvor, B Doyle for C Campbell, D Carson for M Began, G Johnston for J Kelly, S Quinn for P McAleer.
Cavan -- D Murphy; D Reilly, T Corr, K Lynch; M Johnston, J Jordan, P O'Reilly; E McGuigan, A Durkin; N Madden, G Smith, M Cahill, B Fitzpatrick, D Thomas, J McCabe. Subs: M McKeever for G Smith, C Smith for J McCabe; N Walsh for A Durkin; D O'Dowd for M Johnston; M Hannon for K Lynch.
Ref -- F Cleary (Fermanagh).