Rooney akaita gore ra2011 risingafadzi, akadonhedzwa mumasemi-fainari emamita 400 paWorld Championships kuDaegu uye akapedza ari wechisere sechikwata cheBritain mumakwikwi e4 × 400 m relay. Muna 2012 Martyn akatanga zvakanaka, achimhanya 44.92s muna Kubvumbi paMt. SAC Relays muWalnut, California, nguva yake inokurumidza kubvira muna 2008. Rooney akakundikana kuchengetedza chimiro ichocho achienda kumitambo yeOlympic yekumba kwake, uye akabviswa muhafu yekupedzisira yemamita mazana mana, achimhanya 45.31s. Mumakwikwi e4 × 400 metres
Pakupedzisira Martyn akagamuchira mudonzvo ari panzvimbo yechitanhatu ndokumhanya tsoka yechikepe yechipiri yechi 44.1, asi akanga asingakwanisi kukunda Deon Lendore wokuTrinidad uye nokudaro akapedza ari wechina.