O'Gara made his Championship debut for Dublin coming on at half-time in place of Kevin McMenamon.[when?] He had an immediate impact on the game,[which?] causing trouble for the Wexford defence in Dublin's comeback in the Leinster quarter final. O'Gara made a substitute appearance for Dublin in the Leinster semi-final defeat to Meath, which proved to be Dublin's biggest defeat ever to their rivals. This ended Dublin's five year reign as Leinster champions.
Dublin and O'Gara went on to play in the qualifiers at the second round stage. O'Gara scored his first inter county point for Dublin against Tipperary in the second round of the 2010 qualifiers at Croke Park. O'Gara scored a 2-01 in Dublin's victory over Leinster finalists Louth in the final round of the qualifiers at Croke Park. This was O'Gara's highest scoring game for Dublin and his first Championship goal. O'Gara scored a crucial goal against Tyrone during the 2010 All-Ireland quarter final victory. O'Gara scored 3-02 in the 2010 All-Ireland Senior Football Championship.