Would be a war. Hasegawa looks so unstoppable right now at bantamweight, I got him by late TKO or an 8-4 type of decision.
Unless weight problems really hamper him I think Hasegawa should get to him at some point. Just a very dangerous fighter from any range. Montiel is a good experienced fighter but was dropped and given problems by a guy Hasgawa walked through easily. I know styles make fights but it could be that Montiel is just begining to slow down a bit after a long career and some tough fights. Do we know if this fights definately happening? Theres been rumours floating about.
For me this would be the most exciting match-up of the year. Two great fighters battling it out for what would be a top 7-8 P4P position in my book.