Floyd Mayweather Jr.

 If you look at him in a non biased way. You will see that he has the skills to be able to fight in any Era and against the Greatest 135 -147 lb fighters the world has ever known,  he would still be successful, maybe not undefeated but still a World Champion.

Greatest Heavyweights of all time list.

 1.  Ali
 2.  Joe Louis
 3.  Rocky Marciano
 4.  Jack Dempsey
 5.  Jack Johnson
 6.  George Foreman
 7.  Joe Frazier
 8.  Archie Moore
 9.  Mike Tyson
10. Gene Tunney
11. Evander Holyfield
12. Floyd Patterson
13. Sonny Liston
14. Larry Holmes
15. Lennox Lewis

Best of the Modern Generation

Greatest Boxers that have Fought in my Lifetime (at least one Bout in the past 35 years )

1. Ali
2. Roberto Duran
3. Sugar Ray Leonard 
4 George Foreman
5 Julio Cesar Chavez
6. Joe Frazier
7. Ruben Olivares
8. Marvin Hagler
9 Thomas Hearns
10 Larry Holmes
11 Oscar De La Hoya
12 Evander Holyfield
13 Alexis Arguello
14 Marco Antonio Barrera
15 Pernell Whitaker
16 Roy Jones Jr
17 Bernard Hopkins
18. Mayweather Jr.
19 Erik Morales
20 Mike Tyson.

Sugar Ray Robinson will always sitting at the top

173 wins, 109 (KO)19 losses, 6 draws, 2 no contests

Boxing Era: 1940-1965

Many consider Robinson to be the greatest pound for pound boxer of all time. Just boxing prowess considered, he might be. Robinson may be the best combination of boxing talent wrapped up in one man that the world has ever seen. He was a freakish enigma who somehow possessed awesome KO power in his punch, lightning fast speed, outstanding footwork and dexterity, and a solid chin. However, I list him 3rd when all variables in making a boxer “great” are considered. Ali and Louis had more international, political and social significance tied into them and their fights, and it immortalized them. Ali and Louis had more fights in which the entire world was a buzz and tuned in. Aside from that, Robinson is high above the rest.

In addition to his superior boxing ability, Robinson was also memorable for his good looks and flamboyance. He walked with large entourages, credited as the first athlete to have an entourage, he owned a famous night spot in Harlem, and he was known to be an excellent singer and dancer. In and outside the ring his presence was large.

Despite being a dance star in France and all the flash, Robinson was clearly the best warrior in the ring. Muhammad Ali and many of the best boxers around all concurred that he was tops.

Robinson won the middleweight championship a remarkable and unprecedented 5 times. Stylistically he had it all. He had amazing speed and finesse. Robinson also dished out sound beatings, and he could take beatings and rally back in most impressive fashion. He was never out, it was always a matter of how this boxing genius would figure his way out and turn the fight around, and he usually did.

There are many boxers who are always criticized for not being challenged enough by real competition to prove their worth---Robinson isn't one of them. Robinson has proven he was the best of the best with an exclamation point. Robinson defeated a host of Hall of Fame boxers like Jake LaMotta, Kid Gavilan, and Rocky Graziano. Even 16lbs lighter, Robinson beat the legendary “Raging Bull” Jake LaMotta 5 out of 6 fights. Having a check list of over 8 Hall of Fame boxers he eclipsed cements the fact that Robinson should always make the top 3 on any list.

Ray Mancini's Childhood Poem to his father.

  I walk in your shadow  

I watch every step that this man takes, I listen to every sound that this man makes, I touch every part of this mans face, I hold this mans body when we embrace, I cry every tear that this man cries, I try every task that this man tries, I keep every memory that this man keeps, I leap every mountain that this man leaps. I love you dad and I really want you to know, I wanna be like you and walk in your shadow. I wanna be like you and live with your great name, for I am this mans son and I will never bear him shame.