The first World Athletics Championships in America has been rocked after a rising US 400m star was kicked out for tampering with the anti-doping process, while a top Kenyan runner, who has won the Boston and Chicago marathons, was also suspended after testing positive.
The Athletics Integrity Unit confirmed on Saturday Randolph Ross, a 21-year-old Tokyo Olympics relay gold medallist who is the 14th fastest man in history over 400m, had been provisionally suspended and would miss the championships in Eugene.