Ku qor sii wadida cutubkan - Chepkorir waxay ka mid noqotay orodyahannada marathon-ka ugu sarreeya adduunka iyada oo ku guuleysatay Marathon-ka nuska ah ee Berlin bishii Maarso 2010, iyada oo ku guuleysatay 69:43 daqiiqo si ay uga adkaato Eunice Kales. Waxay ku soo laabatay magaalada Jarmalka ee tartanka BIG 25 Berlin, waxayna gashay kaalinta saddexaad. Waxaa loo doortay inay u tartanto Kenya tartanka IAAF World Half Marathon Championships ee 2010
laakiin dhaawac ayaa soo gaabiyay xilli ciyaareedkeedii ka hor inta aysan ka dhigin kulankeedii ugu horeeyay ee caalamiga ah.