Rios in my opinion. Khan would be on his bike bc he can't fight on the inside. Rios can cut the ring off though which will keep him on Khans ass. Khan has the speed to get him by but I think Rios roughs him up and stops him.
Perhaps Rios' biggest strength is the fact that he's so much damn bigger than everyone at lightweight. Who knows how well he can take a punch from the legitimate welters and light welters and who knows if he can even hurt them? I don't think he can beat Khan.
Rios shipped rounds to a domestic journeyman who was tailor made for him, khan is world class and a style mismatch, and not a midget Khan by mid rounds stoppage
Khan, and quite easily too. I hope Rios moves up to try and make this fight, hell Gamboa beats his ass right now at 135 as well.
i think it would be like Cotto vs MArgarito 2 ... the skill, speed and the talent from Khan are just too much for Rios.