Mark Nally, Diarmuid Murtagh and Donie Smith (penalty) all hit the net in the opening period as Nigel Dineen’s side proved far too strong for an outclassed Mayo outfit.
Murtagh, who turned in a man of the match performance for St Pat’s, Drumcondra in the recent Trench Cup final, was the star of the show again here.
The corner-forward pilfered 1-4 in the first half, including two frees, and tormented the Mayo back line.
Mayo had got off to a flying start with a goal from Evan Regan in the third minute, but Roscommon led at the break by 3-5 to 1-3.
Donie Smith’s second goal, two minutes into the second half killed the game as a contest and Mayo were left playing for pride.
Late points from Adam Gallagher, Evan Regan and Eoghan Collins proved too little, too late for them.
MAYO: M Flanagan; K Lynch, L Kitterick, A Butler; C Burke, S Coen, P O’Hora; P Prendergast, D O’Connor (0-1); G O’Donnell, M Plunkett, A Gallagher (0-1); J Shaughnessy (0-1), E Regan (1-3, 2fs), C O’Shea (0-1).
Subs: E Collins (0-1) for O’Hora (inj); S Conroy for Plunkett; A Jordan for Prendergast; M Hall for Burke (black card); S Regan for Shaughnessy.
ROSCOMMON: C Lavin; D Murray, S Mulloly, C Kenny; C Daly, F Kelly, F Sweeney; T O’Rourke, T Corcoran; C Kilcline (0-1), M Healy (0-1), E Smith (0-2); D Murtagh (1-5, 3fs), M Nally (1-0), D Smith (2-0, pen).
Subs R Daly for Sweeney; S Killoran for O’Rourke; J Earley for Kilcline; K Finn for Nally; U Harney (0-1) for Corcoran.
Referee: E O’Grady (Leitrim).