Jamaican Usain Bolt won a third successive Olympic 200m gold on Thursday to keep his hopes of an unprecendented "triple triple" alive and deliver a perfect tonic to the doping-tainted world of track and field.
The victory in his favoured event was Bolt's 13th individual world or Olympic sprint title from a possible 14 since he took athletics by storm at the 2008 Beijing Olympics.
The 29-year timed 19.78 seconds for gold, Canadian Andre de Grasse taking silver with 20.02sec and France's Christophe Lemaitre winning bronze (20.12).
