Bolt to make world bow in career swansong

Usain Bolt has warned that athletics 'will die' if the doping continues to plague the sport

• Bolt will bring to an end his decorated career at the World Championships
• The Jamaican sprinter is out to defend his title in the 100m he won back in 2015

Usain Bolt kicks off the defence of his world 100m on Friday in his swansong season, the first step to bringing down the curtain on his glittering career.

Bolt, dubbed an "extraordinary competitor" by IAAF president Sebastian Coe, will take to the track in London as favourite for the blue riband event, having won eight individual finals at the past four worlds as well as in four 4x100m relay finals.