Nyorai kupfuurira kweiyi ndima - 2002 yakaratidza kubudirira kukuru kweKosgei mune zvose zviri zviviri nzira uye mumugwagwa kumhanya. Muna Chivabvu, akatungamira timu yeKenya kukunda pa2002 IAAF World Half Marathon Championships
nenguva ye 1:00:39. Akakunda Jaouad Gharib kuti akunde mujaho pakuedza kwake kwekutanga kwehafu yemarathon. Kubudirira kwake kekutanga hakuna kumuita mutendeuki pakarepo, zvisinei: "Ndakachinja tarisiro yangu kubva pakumhanyisa kumhanya kusvika pamamita zviuru gumi... Pamwe mumakore maviri kana matatu ndichafunga kumhanya marathon". Kosgei akava shasha yokuKenya pamamita 10 000 muzhizha iroro, uye muedzo wake wakatevera wakauya paMitambo yeCommonwealth ya2002 muManchester, England. Akapinda mumakwikwi emamita zviuru gumi uye aive wechipiri kuseri kwehama yake yekuKenya Wilberforce Talel <unk> Nguva yekupedzisa yaKosgei ya27: 45.46 yaive mazana manomwe ezana rechipiri kuseri kwaTalel, uyo akaputsa rekodhi reMitambo yechiitiko ichi.