I find it funny when some fans say one would destroy the other. I highly doubt it, both are proven elite fighters it would be a quality match up.
How many punchers has Terry actually fought, especially ones his own size, let alone absolutely murderous punching ATG 140 ones with speed, laser-like accuracy and who are absolutely lethal finishers? The way naturally smaller and lighter Cuban leprechaun Gamboa hurt Terry badly and had his head in a fog for 60 seconds from a solitary right hand for goodness sake and Gamboa has only stopped 2 of his 12 opponents at 135 and one was shot. Imagine what a Kosyta laser-guided missile would do to that chin when it detonated on it, let alone what the deadly accurate and speedy follow up salvo with both hands would do while he was in that state? Kostya wouldn't only knock Terry out he'd spark him out in ugly HL reel fashion. He'd fold him. Look at this murderer's row of punchers Ricky Burns Postol Dierry John Hank Lundy Indongo Felix Diaz Jeffery Horn Peg-leg cripple Benavidez Beltran Pity Pat Porter Leprechaun Gamboa Dulorme Shot Molina Shot to bits Khan Shell of Kell Egis is one of the very few legit punchers Tery has fought who is close to him in size and look what happened there. Terry got dropped. Kostya is light years better than Egis. Way better in every single department and he's an ATG puncher with uncanny accuracy, a right hand from hell and lethal blazing combinations and on top of that is also a deadly finisher.
This is a funny thread... Where everyone picks Crawford easily or KT for a demolition job. I'm going for another answer, it will be a very close fight over 12 rounds, 6 a piece or 7 - 5. I could see KT score a knockdown which could pull the win out the bag in a cracking fight.
Tszyu by KO. Why?, it's fairly simple really. Tsyzu is a proven fighter against the best. Crawford is not yet proven and holds a very poor record so far.