Rubuta ci gaba don wannan sakin layi - Osano ya yi gasa ga Kenya tun yana ƙarami kuma a matsayin ɗan wasan ƙwallon ƙafa ya raba a cikin ƙungiyar azurfa a gasar tseren tseren ƙasa ta 1987 IAAF (wanda mai nasara Wilfred Kirochi ya jagoranta) kafin ya dawo a 1989
don kammala na huɗu kuma taimakawa Kenya zuwa taken ƙungiyar tare da masu lambar yabo ta mutum Kipyego Kororia da Stephenson Nyamau. Ya lashe lambar yabo ta mutum daya a gasar zakarun duniya ta matasa a shekarar 1988, inda ya shiga tseren kilomita 20, inda ya zama na biyu ga Zeleke Metaferia na Habasha.