on a recent episode of Shannon Sharpe’s new podcast club Shay Shay, Floyd Mayweather States his case as to why he is the greatest boxer of all time. Floyd Mayweather make some excellent points which fly in the face of the belief of many boxing fans that Muhammad Ali was the greatest boxer of all time. Floyd Mayweather points out the reason why Muhammad Ali is not the greatest boxer of all time, or the goat as many people call it, is because he was gifted to fights victories versus Ken Norton, and lost to Leon spinks who only had seven professional fights. I would also add that Muhammad Ali fought way past his Prime and had some embarrassing losses to taint his career. Floyd Mayweather also pointed out that Rocky Marciano never thought champions. at least, Rocky Marciano never thought the amount of quality opponents Mayweather has defeated.