Which fighter FACED the most world champions in history?

Thomas Hearns fought 19 if I am counting correctly.
Clyde Gray
Harold Weston
Bruce Curry
Muangsurin
Angel Espada
Eddie Gazo
Pipino Cuevas
Sugar Ray Leonard 2x
Wilfred Benitez
Murray Sutherland
Roberto Duran
Marvin Hagler
Mark Medal
Doug Dewitt
Dennis Andries
Iran Barkley 2x
Virgil Hill
Nate Miller
Uriah Grant
Hearns also fought several Olympic champs or contenders
Sugar Ray Leonard Gold medal 1976
James Shuler was on the Olympic team for 1980-US cancelled games
Virgil Hill Olympic silver medalist 1984
Andrew Maynard 1988 Olympic gold medalist.

One note. Hearns fought 20 champs if you count the IBO titlist Lenny Lapaglia, but no one counts that one. So 21 fights against exWorld or World champs.
Find another guy who beat two champions with over 10 title defenses like Cuevas and Hill who are HOF. Hard to do that, and at weights 30 pounds separated. Virgil Hill was not a John Ruiz caliber fighter.

 

RJJ:
Jorge Vaca (WBC ww)
Jorge Fernando Castro (WBA mw)
Bernard Hopkins (IBF/WBA/WBC/WBO mw)
Thulani Malinga (WBC smw)
James Toney (IBF mw, IBF smw, IBF cw)
Vinny Pazienza (IBF lw, WBA lmw)
Eric Lucas (WBC smw)
Mike McCallum (WBA lmw, WBA mw, WBC lhw)
Montell Griffin (WBC lhw)
Virgil Hill (WBA/IBF lhw, WBA cw)
Lou Del Valle (WBA lhw)
Otis Grant (WBO mw)
Reggie Johnson (WBA mw, IBF lhw)
Julio Cesar Gonzalez (WBO lhw)
Clinton Woods (IBF lhw)
John Ruiz (WBA hw)
Antonio Tarver (IBF/WBA/WBC lhw)
Glen Johnson (IBF lhw)
Felix Trinidad (IBF/WBC ww, IBF/WBA lmw, WBA mw)
Joe Calzaghe (IBF/WBA/WBC/WBO smw)
Jeff Lacy (IBF smw)
Danny Green (WBA lhw)
total: 22

 

Oscar De La Hoya:
Troy Dorsey (IBF fw)
Jimmi Bredahl (WBO sfw)
Jorge Paez (IBF/WBO fw)
John John Molina (IBF/WBO sfw)
Rafael Ruelas (IBF lw)
Genaro Hernandez (WBA/WBC sfw)
Jesse James Leija (WBC sfw)
Julio Cesar Chavez (WBC sfw, WBA/WBC lw, IBF/WBC lww)
Miguel Angel Gonzalez (WBC lw)
Pernell Whitaker (IBF/WBA/WBC lw, IBF lww, WBC ww, WBA lmw)
Hector Camacho (WBC sfw, WBC lw, WBO lww)
Ike Quartey (WBA ww)
Felix Trinidad (IBF/WBC ww, IBF/WBA lmw, WBA mw)
Shane Mosley (IBF lw, WBA/WBC ww, WBA/WBC lmw)
Arturo Gatti (IBF sfw, WBC lww)
Javier Castillejo (WBC lmw, WBA mw)
Fernando Vargas (IBF/WBA lmw)
Luis Ramon Campas (IBF lmw)
Felix Sturm (WBA/WBO mw, WBA smw)
Bernard Hopkins (IBF/WBA/WBC/WBO mw)
Ricardo Mayorga (WBA/WBC ww, WBC lmw)
Floyd Mayweather Jr (WBC sfw, WBC lw, WBC lww, IBF/WBC ww, WBC lmw)
Steve Forbes (IBF sfw)
Manny Pacquiao (WBC flw, IBF sbw, WBC sfw, WBC lw, WBO ww)
total: 24

 

if the IBF is used than Hearns is at 22. I am not sure if Campas and Forbes should be used as champions.

 

i have no idea but i know who fought the most H.O.Fers jimmy MCclarnin at 12

 

Sugar Ray Robinson fought 12 as well...

1. Sammy Angott
2. Henry Armstrong
3. Carmen Basilio
4. Kid Gavilan
5. Jake Lamotta
6. Joey Maxim
7. Carl Bobo Olson
8. Randy Turpin
9. Fritzie Zivic
10. Gene Fullmer
11. Joey Giardello
12. Rocky Graziano


Marciano went 6-0 (5) vs. Hall of Famers Louis, Walcott x2, Charles x2, and Moore... pretty impressive as well.


Ezzard Charles fought more than a few. Hall of Famers as well...

1. Teddy Yarosz... win
2. Charley Burley x2... 2 wins
3. Joey Maxim x5... 5 wins
4. Jimmy Bivins x5... 4 wins, 1 loss
5. Lloyd Marshall x3... 2 wins, 1 loss
6. Archie Moore x3... 3 wins
7. Jersey Joe Walcott x4... 2 wins, 2 losses
8. Joe Louis... win
9. Harold Johnson... loss
10. Rocky Marciano x2... 2 losses

28 fights vs. Hall of Famers... pretty good competition to say the least. 21-7 vs. these Hall of Famers

 

Holyfield faced (counting IBF, WBA, WBC, WBO, and Lineal World Titles)-

1. Booze
2. Qawi x2
3. Parkey
4. Ocasio
5. DeLeon
6. Thomas
7. Dokes
8. Douglas
9. Foreman
10. Holmes
11. Bowe x3
12. Moorer x2
13. Mercer
14. Czyz
15. Tyson x2
16. Lewis x2
17. Ruiz x3
18. Rahman
19. Byrd
20. Toney
21. Ibragimov
22. Valuev
23. Botha (he was Champ for a second even though the fight result was later changed to a NC)

 

I know this isnt the question but i think the person who fought the most quality opposition was juan laporte anyways

 

Well, you'd be wrong. By a long ways.