 At the 2009 World Championships in Athletics Dunn set a personal best of 49.95 seconds to qualify for the 400 metres world final.She was a little slower in the final, however, and finished in sixth place.In the 4 x 400 m relay event she finally outpaced everybody, grabbing the gold medal together with teammates Allyson Felix, Lashinda Demus and Sanya Richards.