 With all 9 lanes filled, USA's Lynna Irby took off from the gun, making up the stagger on Chile's Martina Weil-Restrepo.Though looking impressive, she paid for the early speed by tying up on the home stretch, Jamaica's Olympic relay silver medalist Stephanie Ann McPherson putting her team in a clear lead ahead of Cuba and Canada.As Canada's Aiyanna Stiverne took the break, with Cuba's Rose Mary Almanza Blanco looking for running room, USA's Jaide Stepter calmly worked her way behind them.