I'm not saying he got no heart but we seen him run from his opponents and take knees, it's the pot calling the kettle black.
For the last time He barely has any natural athletic ability) He got to where he is due to hard work and dedication Mayweather is not a natural athlete for the last time.
Wlad has to be up there. He's ripped as hell, fast, powerful, everything that involves athleticism he has. Being a huge dude doesn't make it any easier. Also, Pacquiao, Ward, Floyd, Dirrell, Sergio.
Sergio Martinez, not that hard really. He started boxing when he was what 20,and is the second-best boxer in the world right now.