Mezue ahịrịokwu na-esonụ: Afọ 2002 gosipụtara ọganihu dị ịrịba ama maka Kosgei ma n'okporo ụzọ ma n'okporo ụzọ. N'ọnwa Mee, o duru ndị otu Kenya gaa mmeri na asọmpi
2002 IAAF World Half Marathon Championships na oge nke 1:00:39. O meriri Jaouad Gharib iji merie n'ọsọ nke mbụ ya na ọkara marathon. Otú ọ dị, ihe ịga nke ọma ya na nke mbụ emeghị ka ọ gbanwee ozugbo: "M gbanwere uche m site na steeplechase gaa na mita 10,000... Ikekwe n'ime afọ abụọ ma ọ bụ atọ, m ga-amalite iche echiche banyere ịgba ọsọ marathon". Kosgei ghọrọ onye mmeri Kenya na 10,000 m n'oge ọkọchị ahụ, na ule ya ọzọ bịara na 2002 Commonwealth Games na Manchester, England. E tinyere ya n'ọsọ 10,000 m ma bụrụ onye nke abụọ n'azụ onye obodo ya bụ onye Kenya bụ Wilberforce Talel <unk> Oge ngwụcha nke Kosgei nke 27:45.46 bụ asaa nke narị nke abụọ n'azụ Talel, onye mebiri ndekọ egwuregwu maka ihe omume ahụ.