I voted for Keith Thurman. Kell Brook would be my second choice. Tim Bradley (if he defeats Vargas) would be my third. Crawford would be fourth. (Golovkin is a fantasy fight. It's not on either guy's radar.) Khan shouldn't even be included in the poll. He loses to Mayweather and to everyone on the list.
Mayweather would have problems with Khan's speed it would be a massive fight and a fight that could be fight of the year.
I voted Amir Khan because he's always been in exciting fights & Mayweather vs Khan if it happens will be bigger and better than a Mayweather vs Pacquio & fights like these don't happen a lot last fight like this one was made was i think Lennox Lewis vs Mike Tyson.
I really don't care who it is. I'm honestly not very interested in watching him fight on. And if it's his farewell fight, I'm ok with him taking a soft touch
Cotto at Middleweight, Pacquiiao II(most likely won't happen due to Pacquiao's surgery) or Khan. Any of those is fine with me.
I'll give him the most credit for fighting Crawford. Gennady Golovkin makes no sense for him. Amir Khan.... u know) Danny Garcia - the safest option, Mayweather will win 11 out of 12 rounds easily Keith Thurman .. a good option as well Lucas Mathysse won't contribute to his legacy Kell Brook is not recognizable in US.