When the biggest boxing upsets occur - it's invariably in the heavyweight division. An 7/1 upstart called Cassius Clay shook up the world half-a-century ago when he stunned Sonny Liston.
A decade later Clay had changed his name and the world had changed their mind about the self-styled Greatest. But Muhammad Ali was still a 4/1 underdog when he floored George Foreman.
Hasim Rahman was 20/1 when he unleashed a right hand that inflicted only the second defeat of Lennox Lewis's career. And when the biggest outsider of the lot, James 'Buster' Douglas, shocked Iron Mike Tyson in 1990 only one Las Vegas bookie was brave - or stupid enough - to set odds.
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