Mezue ahịrịokwu na-esonụ: Ahụmịhe mbụ ya na asọmpi egwuregwu na-agba ọsọ bụ dị ka onye na-agba ọsọ n'ụlọ akwụkwọ sekọndrị na John Anderson, onye ọka ikpe maka usoro telivishọn UK "Gladiators" na onye nkuzi nke onye bụbu onye na-edekọ ụwa Dave Moorcroft, gbara ya ume ka ọ lekwasị anya na egwuregwu. Na-azụ ọzụzụ na Corby Athletics Club, ọ malitere ịsọ mpi na decathlon na ihe mgbochi 110 mita wee bụrụ onye ama ama n'etiti ndị na-erubeghị afọ 20 na egwuregwu abụọ ahụ. N'egwuregwu Amateur Athletic Association (AAA) n'okpuru afọ iri abụọ n'afọ 2003, ọ meriri decathlon. Nnukwu asọmpi mbụ ya bụ asọmpi European Athletics Junior nke 2003, ebe ọ kwụsịrị nke ise na njedebe nke 110 m. Ọ gbara asọmpi na nzukọ AAA nke 2004 wee mechie nke atọ na ihe mgbochi, n'azụ Robert Newton na Paul Gray. Na
Na 2005 European Athletics U23 Championships, Sharman nọ na mpụga nke ihe nrite na ebe nke anọ. Mmerụ ahụ n'ubu n'afọ ahụ emebiwo ikike ọ na-atụ javelin ma ọ mere mkpebi ịhapụ decathlon iji lekwasị anya naanị na hurdling.