Tobi Amusan became the first Nigerian ever to win gold at the World Athletics Championships after racing to a stunning world record time of 12.06s.     It was the second time Amusan would break the record on the night, improving on her 12.12s in the semi-final. It was previously set by America’s Kendra Harrison’s at 12.20s.   On a night of many firsts, Amusan became the first Nigerian athlete to ever set a World Record in any event. It will also be the first time the Nigerian anthem would be played over the public address system during medal presentation