Contepomi put his side on the scoreboard with a 15th minute penalty and he landed a second in the 38th minute after Bryan Young was penalised for dropping a knee into the belly of the prone Mario Ayerza, the Irish prop lucky to have remained on the field for his needless action.
Argentina: B Stortoni (Bristol); T De Vedia (Saracens), M Avramovic (Worcester Warriors), H Senillosa (Hindu), F Leonelli (Glasgow Warriors); F Contepomi (Leinster) capt, N Vergallo (Jockey Club Rosario); M Ayerza (Leicester Tigers), A Vernet Basualdo (Alumni), S Gonzalez Bonorino (Capitolina); P Bouza (Leeds), E Lozada (CASI); M Durand (Montpellier), JM Fernandez Lobbe (Sale Sharks), JM Leguizamon (London Irish). Replacements: M Cortese (Northampton Saints), JC Fernandez Miranda, H Agulla (both Hindu), G Fessia (Cordoba Athletic), J Stuart (both CASI), L Lopez Fleming (Edinburgh Gunners), P Cardinali (CSBJ Rugby).
Ireland: G Duffy; B Carney, A Trimble, K Lewis, T Bowe; P Wallace, I Boss; B Young, J Flannery, S Best capt; T Hogan, M O'Kelly; N Best, K Gleeson, J Heaslip. Replacements: B Jackman, T Buckley, M O'Driscoll, S Ferris, T O'Leary, G Murphy, B Murphy