Pedzisa mutsara unotevera: Rooney aive negore ra2011 risingafadzi, akadonhedzwa mumasemi-fainari emamita mazana mana paWorld Championships muDaegu uye akapedza ari wechisere sechikwata cheBritish mu4 × 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. Mu
4 × 400 metres relay yekupedzisira Martyn akagamuchira baton munzvimbo yechitanhatu uye akamhanya 44.1 yechipiri anchor gumbo, asi aisakwanisa kupfuura Deon Lendore weTrinidad uye saka akapedza wechina.