 Burnett akatanga kukwikwidza padanho repasi rose muna 2000 pa3 Nations Junior International. PaASA National Championships, akahwina ndarama mumamita makumi mashanu kumusana muna 2001 na2002. Pazano raPay, Burnett akachinjira kushambira akasununguka muna 2003 ndokutanga kubudirira. Kutanga kwake paterevhizheni kwakaitika muna 2002 paManchester Commonwealth Games, kwaakakwikwidza mumakwikwi e4 × 200-metre freestyle relay uye akahwina menduru yebronze. Mumitambo yeOlympic yakatevera, Burnett akapedza 7th mumamita mazana maviri akasununguka, uye akakwikwidza muchikwata che4 × 200-metre freestyle relay, iyo yakapedza 4th, ichipotsa yakabata menduru dzebronze. Miedzo yeBritain yeMitambo yakanga yabudirira zvikuru nokuda kwaSimon, umo akakunda menduru yesirivha mumamita 100 akasununguka uye menduru yegoridhe mumamita 200 akasununguka, pasinei nokuti akanga atyoka chigunwe chake mutsaona yokuchovha bhasikoro muArizona mwedzi miviri yakanga yapfuura. Iye zvino akanga ava kubuda somumhanyi akakurumbira weBritain. Achishambira kuYunivhesiti yeArizona, Burnett akakwikwidza muAmerican NCAAs uye akahwina goridhe mugore rake rekutanga mu200-yard freestyle uye muna 2005. 2005 zvimwe raiva gore rake rakanakisisa asi, kudzokera kuEngland uyewo nokuda ASA National Championships. Akakunda menduru nhatu dzegoridhe mumakwikwi emamita 50, 100, uye 200 akasununguka, zvose zvaiva zvinyorwa zvitsva zveBritain. MuUnited States, akatyorawo rekodhi yemakore gumi nemanomwe yemamirimita mazana maviri akasununguka yakagadzwa naMat Biondi pa1: 33.03; Burnett akabhururuka 1: 32.22. 