Career
During his 100th game against the Lions at Ellis Park Stadium on 21 June 2008, he scored three tries for the Bulls, and went on to score the most tries (7) by any Bulls player that year. In 2008 he made his debut in the Super 14 series, winning 3 caps, having previously played in the 2004 Super 12 competition. Mametsa had intervened on behalf of team-mate Fudge Mabeta, an occasional lock for the Bulls, who had allegedly reversed his car into a traffic official’s vehicle.
All charges against Mametsa were withdrawn in the Hatfield Community Court on 2 June 2009.
His 64 career tries placed him third on the list of all-time tries scored by Blue Bulls players, and he is 12th on the Bulls" list of most career matches.