Oliver McCall, who lost his World Council heavyweight championship to Frank Bruno earlier this month in Wembley Stadium, lost again in St Louis on Thursday.
Three men robbed McCall of his loser's purse - a cheque for $1.4m (pounds 927,500) which he had tried to hide in a sock - at about 3am police said.
Police arrested two suspects and recovered the cheque. However, McCall denied the incident had happened. "Man, I don't know what you're talking about," he told a local newspaper. "I love St Louis. What robbery? I wasn't robbed."
The suspects were both freed because McCall said he did not wish to press charges.
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