At the 2015 World Championships he won the gold medal with a throw of 92.72m, becoming the first Kenyan to win a World Championships gold medal in a field event.
No Campionato Mundial de Atletismo de 2015 gañou a medalla de ouro cun lanzamento de 92,72m, converténdose no primeiro kenyano en gañar unha medalla de ouro nunha proba de campo dun Campionato Mundial.