US sprinter Erriyon Knighton has been banned for four years for a failed test and Ethiopia’s Diribe Welteji is ineligible to run because of a pending appeal
Who are the biggest stars, what are their chances and how will the Brits fare in Tokyo? All your questions about the World Athletics Championships answered
From the pole vaulter in a class of his own to Kipyegon and Warholm, the world championships that begin in Japan this weekend offer tantalising chances for new global marks