Silly as it may seem, I'd give Khan more chance (slim one) of pulling off an upset against Floyd than beating Porter.

All the fighter's that give Khan trouble - ignoring the ones that have chinned him - have been able to walk him down and constantly pressure him - Peterson, Maidana, Diaz and Algieri.

Khan would never keep Porter off, get manhandled all round the ring then try and punch with him on the inside and get chinned.