London — Usain Bolt kicks off the defence of his world 100m on Friday in his swan song 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. The 30-year-old Jamaican has only suffered one hiccup: when he false started in the 100m final in Daegu in 2011. "That’s not going to happen this time," joked Bolt, who also has eight Olympic golds to his name. "If I show up at a championships I’m fully confident." Coe heaped praise on the Jamaican on Thursday, but said he remained optimistic for track and field in the post-Bolt era. "You won’t be particularly surprised when I say I’m sad he’s going," said Coe, who won two Olympic 1,500m gold medals for Britain. "I’m an athletics fan, I take my federation hat off, the guy has b...

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