The 20 - year - old just edged out Powell with Ramon Gittens of Barbados third in a photo finish .
The 20 - year - old made worldwide headlines in June last year when he clocked an astonishing 9.84 sec at the US trials .
The 20 - year - old , who made worldwide headlines in June last year when he clocked an astonishing 9.84 sec at the US trials , just edged out Powell with Ramon Gittens of Barbados third in a photo finish .