BERLIN - AUGUST 23:  Allyson Felix of United States waves to the TV camera as she wins gold in the women's 4x400 Metres Relay Final during day nine of the 12th IAAF World Athletics Championships at the Olympic Stadium on August 23, 2009 in Berlin, Germany. Getty Images logo Getty Images 3 months ago

BERLIN - AUGUST 23: Allyson Felix of United States waves to the TV camera as she wins gold in the women's 4x400 Metres Relay Final during day nine of the 12th IAAF World Athletics Championships at the Olympic Stadium on August 23, 2009 in Berlin, Germany.