Refer to this
thread . Tyson only signed to be promoted by K-1 if he fights in Japan, whether it be boxing or K-1 rules. As I mentioned, Sapp is a joke and would stand no chance against Tyson (in boxing or K-1, not MMA). I doubt this fight will ever take place though. Tyson can probably make quite a bit more fighting in the US against someone like Shannon Briggs.