If a fighter had substantial number of fights after 1970 he is eligible and his whole career counts. The criteria gives great weight to wins over HOF quality fighters, long title reigns as THE MAN in a given division and fighting difficult rosters. I am measuring Historical impact here not style preferences. And once again all losses count whether one considers a fighter prime or not is irrelevant if said fighter had won then there wouldn't be any excuse. so here we go.
1. Roy Jones Jr.--4 division world champ went undefeated for 15 years..only losses came to good championship quality fighters. amasses 22 title defenses over 3 different weight classes.
2. Muhammad Ali--Muhammad Ali-Why-Fought the most difficult roster of heavyweights in history. Second most defenses of any heavyweight. Best Wins-Frazier, Foreman, Norton, Liston. Bad Losses-Leon Spinks.
3. Floyd Mayweather Jr.--amasses 5 titles over 5 weight classes, first fighter to do so while remaining undefeated..went 18-0 in championship fights, amassed 12 title defenses during his championship reign. that lasted 11 years.
4. Sugar Ray Leonard-Why-Best of the best welterweight era in history. Defeated Marvin Hagler in an all-time performance. Won straps at 154, THe MAN at 160, and 168. Best Wins-Benitez, Hearns, Duran, Hagler. Bad Losses-None.
5.Larry Holmes-Why-The heavyweight king for seven years with 20 defenses. Best Wins-Norton, Cooney, Bad Losses-None.
6. Marvin Hagler-Why-Almost seven years as middleweight champ. 13 defenses. Best Wins-Hearns, Duran, Hamsho, Antuofuermo. Bad Losses-None
7. Bernard Hopkins-Why-Middleweight champ for nine years, undisputed for five. Total of 20 defenses. Won strap at 175. Best Wins-Trinidad, Tarver, Pavlik, Holmes. Bad Losses-None.
8. Pernell Whittaker-Why-Wrecked the lightweights (8 defenses), won straps at 140, 147 (8 defenses) and 154. Best Wins-Chavez (yeah it was a win), Azumah Nelson, JC Vasquez, McGirt bad loss-JL Ramirez (but not really).
9. Tommy Hearns-Belts at 147, 154, 160, 168,175 and 190. Best Wins-Cuevas, Duran, Hill, Benitez. Bad losses-Iran Barkley
10. Carlos Monzon-Why-Seven years as Middleweight champion, never lost title, 15 defenses, fought everybody. Best Wins-Benvenuti, Griffith, Napoles, Valdez. Bad Losses-Not for the last 13 years of his career.
11. Evander Holyfield-Why-Best cruiser in history. Defeated a series of much bigger heavies. fought everybody. Best Wins-Qawi, Bowe, Moorer, Foreman, Tyson. Bad losses-None.
12. Roberto Duran-Why-Ruined the lightweight division, moved up and defeated a top 3 all-time welter and a HOF welter to become the man at 147. Won straps at 154 and 160. Fought a top three all-time 160 to a near standstill. Best Wins-DeJesus, Leonard, Moore, Barkley, Palomino. Bad Losses Kirkland Laing, "No Mas."
13. Alexis Arguello-Why-Arguably the greatest 130 of all-time. Belts at 126, 130 and 135. Best Wins-Olivares, Chacon, Castillo, Limon, Watt, Mancini. Bad Losses-Vilomar Fernandez.
14. Michael Spinks-Why-The best of the best crop of light heavies in history, 11 defenses, moves up to defeat larry Holmes at heavy. Best Wins-Holmes, Qawi. Bad losses-None.
15. Julio Cesar Chavez-Why-9 defenses at 130, never lost belt, 2 defenses at 135 never lost belt, 18 defenses at 140 (lost to Randall and Oscar) Bets Wins-Taylor, Rosario, Martinez, Castillo, Camacho Bad Losses-None.
16. George Foreman-Oldest man to win heavyweight title. Best wins-Frazier, Norton, Moorer. Bad Losses-Jimmy Young.
17. Mike Tyson-unified title youngest heavy champ in history
18. lennox lewis--most dominant heavy of 2000's and 1990's
19. Felix Trinidad-16 defenses at 147, unified division. Beat best 2 154's and won a strap at 160. Best wins-Vargas, Camacho, Campas. Bad losses-None.
20. Jose Napoles-Why-Six years as welterweight champion, 12 defenses. Best wins-Griffith, Cokes, Hedgemon Lewis, Perkins. Bad Losses-Billy Backus

1. Roy Jones Jr.--4 division world champ went undefeated for 15 years..only losses came to good championship quality fighters. amasses 22 title defenses over 3 different weight classes.
2. Muhammad Ali--Muhammad Ali-Why-Fought the most difficult roster of heavyweights in history. Second most defenses of any heavyweight. Best Wins-Frazier, Foreman, Norton, Liston. Bad Losses-Leon Spinks.
3. Floyd Mayweather Jr.--amasses 5 titles over 5 weight classes, first fighter to do so while remaining undefeated..went 18-0 in championship fights, amassed 12 title defenses during his championship reign. that lasted 11 years.
4. Sugar Ray Leonard-Why-Best of the best welterweight era in history. Defeated Marvin Hagler in an all-time performance. Won straps at 154, THe MAN at 160, and 168. Best Wins-Benitez, Hearns, Duran, Hagler. Bad Losses-None.
5.Larry Holmes-Why-The heavyweight king for seven years with 20 defenses. Best Wins-Norton, Cooney, Bad Losses-None.
6. Marvin Hagler-Why-Almost seven years as middleweight champ. 13 defenses. Best Wins-Hearns, Duran, Hamsho, Antuofuermo. Bad Losses-None
7. Bernard Hopkins-Why-Middleweight champ for nine years, undisputed for five. Total of 20 defenses. Won strap at 175. Best Wins-Trinidad, Tarver, Pavlik, Holmes. Bad Losses-None.
8. Pernell Whittaker-Why-Wrecked the lightweights (8 defenses), won straps at 140, 147 (8 defenses) and 154. Best Wins-Chavez (yeah it was a win), Azumah Nelson, JC Vasquez, McGirt bad loss-JL Ramirez (but not really).
9. Tommy Hearns-Belts at 147, 154, 160, 168,175 and 190. Best Wins-Cuevas, Duran, Hill, Benitez. Bad losses-Iran Barkley
10. Carlos Monzon-Why-Seven years as Middleweight champion, never lost title, 15 defenses, fought everybody. Best Wins-Benvenuti, Griffith, Napoles, Valdez. Bad Losses-Not for the last 13 years of his career.
11. Evander Holyfield-Why-Best cruiser in history. Defeated a series of much bigger heavies. fought everybody. Best Wins-Qawi, Bowe, Moorer, Foreman, Tyson. Bad losses-None.
12. Roberto Duran-Why-Ruined the lightweight division, moved up and defeated a top 3 all-time welter and a HOF welter to become the man at 147. Won straps at 154 and 160. Fought a top three all-time 160 to a near standstill. Best Wins-DeJesus, Leonard, Moore, Barkley, Palomino. Bad Losses Kirkland Laing, "No Mas."
13. Alexis Arguello-Why-Arguably the greatest 130 of all-time. Belts at 126, 130 and 135. Best Wins-Olivares, Chacon, Castillo, Limon, Watt, Mancini. Bad Losses-Vilomar Fernandez.
14. Michael Spinks-Why-The best of the best crop of light heavies in history, 11 defenses, moves up to defeat larry Holmes at heavy. Best Wins-Holmes, Qawi. Bad losses-None.
15. Julio Cesar Chavez-Why-9 defenses at 130, never lost belt, 2 defenses at 135 never lost belt, 18 defenses at 140 (lost to Randall and Oscar) Bets Wins-Taylor, Rosario, Martinez, Castillo, Camacho Bad Losses-None.
16. George Foreman-Oldest man to win heavyweight title. Best wins-Frazier, Norton, Moorer. Bad Losses-Jimmy Young.
17. Mike Tyson-unified title youngest heavy champ in history
18. lennox lewis--most dominant heavy of 2000's and 1990's
19. Felix Trinidad-16 defenses at 147, unified division. Beat best 2 154's and won a strap at 160. Best wins-Vargas, Camacho, Campas. Bad losses-None.
20. Jose Napoles-Why-Six years as welterweight champion, 12 defenses. Best wins-Griffith, Cokes, Hedgemon Lewis, Perkins. Bad Losses-Billy Backus
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