I know it's a tough one as there are so many. But right now, for me, I think this Somrak vs Boonlai fight is hard to beat (I don't know exactly which installment this is as I think they may have fought several times). EDIT: I just wanted to add that Somrak has some of the the best reflexes I have ever seen. Possibly the best reflexes I have ever seen. It's almost as if he sees his apanyent moving in slow-motion. It would have been interesting to perform some neurological tests on him in his prime. He must have like top 0.0001% reflexes for humans, it's just unbelievable.