Kammala jumla mai zuwa: A shekara talatin da huɗu, Kejzar ya fara halartar wasannin Olympics na bazara na 2000 a Sydney, inda ya sanya na sittin da biyu daga cikin masu gudu ɗari a tseren marathon na maza, tare da lokacin 2: 26:38, daƙiƙa goma sha huɗu a bayan Zebedayo Bayo na Tanzania. Ya nuna rawar gani a wasannin Olympics na 2004 a Athens, lokacin da ya gama na hamsin da hudu a gasar Olympics ta 2004.
marathon a karo na biyu, ya rubuta mafi kyawun aikinsa na Olympics na 2:23:34.