Paris (AFP)

Christian Coleman wears a big smile after his first world title in 100m won in Doha. But the coronation of the young American (23 years old) did not make everyone laugh. A month before the start of the Worlds, the US racing car had been pinned for three breaches of its localization obligations for doping controls. He was finally cleared by the American Anti-Doping Agency (Usada) but his image took a big hit and a halo of doubts now surrounds each of the Atlanta rider's outings. What will happen to Tokyo, where he can become Bolt's successor?

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