Whakaotihia te rerenga e whai ake nei: Ko ana wheako tuatahi o te whakataetae tuaka me te mara i te wa e peke ana i te kura tuarua me John Anderson, te kaiwhakawa mo te raupapa pouaka whakaata o te UK "Gladiators" me te kaiako o te rangatira o mua o te ao, a Dave Moorcroft, i akiaki ia ki te arotahi ki nga hakinakina. I te whakangungu i te Corby Athletics Club, ka tiimata tana whakataetae i te decathlon me te 110 mita hurdles a ka noho ia hei Nama 1 i raro i te 20 nga kaitakaro o Ingarangi i roto i nga kaupapa e rua. I te Amateur Athletic Association (AAA) i raro i te 20 tau i te tau 2003, i toa ia i te decathlon. Ko tana whakataetae rangatahi tuatahi ko te 2003 European Athletics Junior Championships, i te wa i mutu ai ia i te tuarima i te whakamutunga o te 110 m hurdles. I whakataetae ia i te hui AAA 2004 a i mutu i te tuatoru o nga arai, i muri i a Robert Newton me Paul Gray. I te
Ko te 2005 European Athletics U23 Championships, ko Sharman i tua atu o nga mētara me te wha o nga waahi. Na te whara i te pokohiwi i taua tau i kino ai tana kaha ki te maka tao, a ka whakatau ia ki te whakarere i te decathlon kia aro noa ki te aukati.