Kammala jumla mai zuwa: Mamashayev ya wakilci Kazakhstan a Wasannin Olympics na 2008 a Beijing, inda ya yi gasa don
tseren marathon na maza. Ya yi nasarar kammala tseren a matsayi na saba'in da dakika goma sha tara a bayan Seteng Ayele na Isra'ila, tare da lokacin 2:30:26.