Musi waJune 24, 2012, akapedza ari wechi4 mumakwikwi emamita 400 pa2012 United States Olympic Trials, chiitiko chakaita kuti awane nzvimbo muUnited States Olympic team senhengo ye4x400 relay. Pamakwikwi eOlympics
, Mance akanga ari rutivi rwechikwata cheAmerica chakanga chisina kusimba chakahwina menduru yesirivha. Mumakwikwi e semi-finals, Mance akatora baton kubva kuna Manteo Mitchell mushure mekunge Mitchell apedza hafu yedenderedzwa neyakazove gumbo rakatyoka. Mance akabatsira kudhonza chikwata kudzokera panzvimbo kuti chikwanise kuenda kumagumo. Mumutambo wokupedzisira, chikwata cheBahamas chakahwina chakarova chikwata chavo, chichiisa chakanakisisa chavo, Chris Brown munhanho inotungamirira. Rutsoka rwechipiri rwaMance rwakaita kuti U.S. irwisane nepo zvikwata zviviri zvacho zvakabva panhandare. Mance akapfuudza kuna Tony McQuay uyo akamhanya 43.4 kupatsanura kunoshamisa kuti atungamirire. Munotsiva waMitchell, mutambi anotamba nemipingamupinyi Angelo Taylor akadonhedzwa mumamita 50 okupedzisira naRamon Miller kuti Bahamas ikunde.