Tobi Amusan began her quest for a podium finish in the 100 metres women hurdles event by winning her heat in a time of 12.49s and qualifying for the semi-finals.
Amusan who is the current world record holder was quicker than USA’s Alaysha Johnson in 2nd with 12. 61s and Janeek Brown in 12.84s in Heat 1.
The time means Amsuan finishes as the second over-all fastest qualifier behind defending Olympic champion, Puerto Rico Jasmine Camacho-Quinn.
Nigeria is yet to win a medal at this year’s Olympics.
