(L-R) Sanya Richards, Debbie Dunn, Allyson Felix and Lashinda Demus of the United States celebrate winning the gold medal in the women's 4x400 Metres Relay Finalduring day nine of the 12th IAAF World Athletics Championships at the Olympic Stadium on August 23, 2009 in Berlin, Germany. (Photo by Vid Ponikvar / Sportida)