Usain Bolt again delivered when it mattered as he scorched to the fastest time of 2015 to win a record fourth straight world 200m title in 19.55 seconds and sweep the individual sprints at a global championships for a fifth time. 

The race of the championships

Olympic champion Usain Bolt was unable to claim victory in his first Diamond League race of the season as Justin Gatlin continued his impressive form by edging out the Jamaican to win the 100 metres in Rome.