At the gun , Richards - Ross took off , making up most of the stagger on Krivoshapka to her immediate outside .
In the first semi , Sanya Richards - Ross was matched with the defending champion Christine Ohuruogu , with only two automatic qualifiers .
At the gun , Sanya Richards - Ross     took off , making up most of the stagger on Krivoshapka to Sanya Richards - Ross ' immediate outside .
In the first semi , Sanya Richards - Ross was matched with the defending champion Christine Ohuruogu , with only two automatic qualifiers .