If the world ended today what would be the biggest fights never made that could have been?

[Wurider]

I posted on here that I feel like alot of these guys are afraid each other and that is why we as fans never get alot of the fights we want to see. But in your opinion what are/were some of the biggest fights never made in your opinion. Feel free to go to any point in any generation. I will start with the obvious and its Spence vs. Crawford for today and historically Lennox Lewis vs Rid**** Bowe, and Rid**** Bowe vs. Mike Tyson. Probably the all time Leonard vs. Hagler 2.