Kammala jumlar da ke gaba: A lokacin da yake da shekaru talatin da hudu, Kejzar ya fara halartar wasannin Olympics na 2000 a Sydney, inda ya sanya na sittin da biyu daga cikin 'yan wasa dari a gasar.
marathon na maza, tare da lokaci na 2: 26:38, daƙiƙa goma sha huɗu a bayan Zebedayo Bayo na Tanzania. Ya nuna kyakkyawan wasan kwaikwayon a Wasannin Olympics na 2004 a Athens, lokacin da ya gama na hamsin da hudu a cikin tseren marathon a karo na biyu, inda ya sanya mafi kyawun lokacin aikinsa na Olympics na 2: 23:34.