Mezue ahịrịokwu na-esonụ: Na June 24, 2012, o mechara nke anọ na mita 400 na 2012 United States Olympic Trials, ihe si na ya pụta mere ka o nweta ọnọdụ na United States Olympic team dị ka onye so na 4x400 relay.
N'egwuregwu Olimpik, Mance so n'òtù ndị America na-ejighị n'aka bụ́ ndị meriri na ọlaọcha. Na ọkara-ikpeazụ, Mance weghaara Manteo Mitchell mgbe Mitchell mechara ọkara okirikiri na ihe mechara bụrụ ụkwụ gbajiri agbaji. Mance nyeere ndị otu aka ịlaghachi n'ọnọdụ ha iji ruo eruo n'egwuregwu ikpeazụ. Na ngwụcha, ndị otu Bahamas meriri ndị otu ha, na-etinye ndị kachasị mma ha, Chris Brown n'isi ụkwụ. Ụkwụ nke abụọ nke Mance dọtara ndị US n'ime esemokwu ka ìgwè abụọ ahụ si n'ọhịa pụọ. Mance nyefere Tony McQuay onye gbara ọsọ dị egwu 43.4 kewara iji bute ụzọ. Onye ga-anọchi Mitchell, onye na-agba ọsọ ihe mgbochi Angelo Taylor apụọla na mita 50 ikpeazụ site n'aka Ramon Miller iji nye Bahamas mmeri.