Tobi Amusan became the first Nigerian to win gold at the world athletics championships after racing to a world record time of 12.06s. Amusan erased the old record of 12.20s set by America's Kendra Harrison.  Abiola Onakoya is an athletics coach, who discovered Tobi Amusan as a secondary school student in Nigeria, and he spoke to reporter Mike Mbonye about the new world record set by the 25-year-old at the world athletics championships held in Eugene, Oregon.