Allyson Felix - USA
Name: Allyson Felix
Crossing across all the sprint distances, Felix has been a consistently dominant performer for many years, winning multiple golds at the World Championships going back to 2005. The 200m is her strongest event - but her only Olympic gold to date has come in the 4x400m relay, having been beaten into silver in the 200m at both the 2004 and 2008 Olympics. Could London be third time lucky for her?