Kineke Alexander entered the women's 400 metres with a qualifying best time of 52.57 seconds. As her time was 0.22 seconds slower than the B standard qualifying time, Alexander received a non-qualified Olympic spot. On 3 August at the Olympic Stadium, Williams did not finish the sixth heat. With her DNF, Williams did not advance to the semi-finals. Overall, Alexander was tied for 46th place out of 49 athletes.