Kosta probably KO's him. While Kosta isn't a mover, Lopez doesn't have the style to pressure and trade with Tszyu to grind him down like Hatton and Phillips did. He'd stand off him in Kostya's range and try and slip and counter, but Tszyu is better technically and hits even harder and is just as good if not better at counter punching. Only real edge I give to Lopez is his defence but Tszyu is too accurate and Lopez simply doesn't throw in enough volume to keep Tszyu contained and in the end Tszyu just lands too many hard shots and stops Lopez. Lopez vs Hatton would be more competitive as Hatton's aggression would play into Lopez's style.