O'Gara's last minute conversion against Gloucester on 18 January 2003 helped Munster to a 27-point victory which took them through to the Heineken Cup quarter final; this match has come to be known in Munster folklore as the "Miracle Match". He was part of the Munster team that won the 2002–03 Celtic League, starting and scoring 12 points as Munster beat Neath 37–17 in the Millennium Stadium. O'Gara turned down the chance to join NFL side Miami Dolphins in March 2003. He started when Munster beat Llanelli Scarlets to win the Celtic Cup in May 2005, scoring 17 points in the game.