Mamashayev akamiririra Kazakhstan kumitambo yeOlympic yezhizha ya2008 muBeijing, kwaakakwikwidza mumutambo wemarathon wevarume
. Akabudirira kupedza nhangemutange iri panzvimbo yechinomwe nemasekondi gumi nemapfumbamwe kumashure kwaIsrael Seteng Ayele, nenguva ye2:30:26.