'I was UFC heavyweight champ - now I'll rule boxing'

Junior Dos Santos knows the bleak recent history of crossover fighters. He has seen his fellow MMA stars fail in the boxing ring but has long suspected he could break the mould.

'I was UFC heavyweight champ - now I'll rule boxing'
Junior Dos Santos knows the bleak recent history of crossover fighters. He has seen his fellow MMA stars fail in the boxing ring but has long suspected he could break the mould.