First off, I am going to list down the achievements of each of these amazing boxers to help support my conclusion as to who deserves to be King starting with Floyd Mayweather Jr.
Floyd Mayweather Jr. has defeated many of the recent greats of boxing including – Juan Manuel Marquez, Miguel Cotto, Shane Mosley, Ricky Hatton, Oscar De Le Hoya, and many other big names. It is because of this you have to give him a lot of credit. He has always possessed a unique defense, which I believe has permanently revolutionized the art of boxing. In addition to this, he has pinpoint accuracy and very intelligent ring-smarts. I believe he could face basically any boxer of today and win unanimously. However, I do believe some of the above boxers I have mentioned could possibly come out on top.