To many, Muhammad Ali is one of the greatest (if not the greatest) boxers of all time. Unfortunately, Floyd Mayweather disagrees with most people.

Floyd Mayweather already revealed in an April interview with Stephen A. Smith that he deems himself as a better boxer than Muhammad Ali.

But Floyd Mayweather also thinks that there are three other boxers out there who were much better than the "Thrilla In Manila" champion, making Muhammad Ali only the fifth greatest boxer of all time in Mayweather's book.

Just last week, Floyd Mayweather was on ESPN Deportes - where he made a "The Best Ever" list for the show's segment. When asked to rank his five best boxers of all time, it came to no surprise that he ranked himself at the top spot.

He then ranked Roberto Duran as second, Pernell Whitaker for the third spot, Julio Cesar Chavez fourth, and Muhammad Ali as fifth.

Although Floyd Mayweather has every right to pose his own opinions on said list, many boxing enthusiasts are sure to argue about Muhammad Ali's spot.

According to Mayweather, Muhammad Ali got the fifth spot because "Muhammad Ali lost to Leon Spinks, and Leon Spinks only had seven fights when he beat him."

Not only that, but he also notes that "[Ali] was only at one weight class" and "Ali really lost all three times to Ken Norton."

However, Mayweather did credit Muhammad Ali's influence on the world: "Ali was the greatest for standing up in an era where black people didn't stand up for each other."

Watch the ESPN Deportes segment below.