Sean O'Brien has emerged in the past few seasons as one of the most destructive back-row forwards in the game. Such was his form during the 2011 Heineken Cup, which his side Leinster won, that he was named ERC European player of the year. He made his Ireland debut in 2009 against Fiji. During the 2011 Six Nations O'Brien topped Ireland's statistics for the number of carries, clean breaks and defenders beaten.