BIRMINGHAM, ENGLAND - AUGUST 24: USA's Alison Felix competes in the Womens 100m semi finals during the Sainsbury's Birmingham Grand Prix at Alexander Stadium on August 24, 2014 in Birmingham, England. (Photo by Gareth Copley/Getty Images)
BIRMINGHAM, ENGLAND - AUGUST 24: USA's Alison Felix competes in the Womens 100m semi finals during the Sainsbury's Birmingham Grand Prix at Alexander Stadium on August 24, 2014 in Birmingham, England. (Photo by Gareth Copley/Getty Images)