Best Middleweight Floyd Mayweather can beat?

Seems unfair to not include Canelo. He didn't beat the best version, but he beat him so soundly, the added bulk and improved defensive mastery would not have bridged the gap against a naturally faster, better fighter, in my opinion.

Of the ones mentioned in the thread, I wouldn't favor him over the likes of Tiger, LaMotta, or Martinez, but he should have enough for Graziano and Taylor.