Broan was first in heat two in 54.02 sec while Miller finished on top of the pile in the fourth heat in 52.71 sec .
Both Rashan Brown and Shaunae Miller advanced in the 400m .
Broan was first in heat two in 54.02 sec while Shaunae Miller finished on top of the pile in the fourth heat in 52.71 sec .
Both Rashan Brown and Shaunae Miller advanced in the 400m .