Pedzisa mutsara unotevera: Musi waJune 24, 2012, akapedza ari wechi4 mumakwikwi emamita 400 kuUnited States Olympic Trials ya2012, uye izvi zvakaita kuti akodzere kuva nhengo yechikwata cheUnited States cheOlympic mumakwikwi e4x400.
PaOlympics, Mance akanga ari rutivi rwechikwata cheAmerica chisina chokwadi 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.