Who was the only heavy weight professional boxer to retire undefeated?

There were many such as:

UNDEFEATED BOXERS

Number One, Paddy Monaghan-Bare Knuckle Boxing m/weight World Champion

http://hometown.aol.co.uk/__121b_c27evizYKq9HHTfZLDCCEgW6npDUPl51WOFsu41fQmpw+j0XH0n8jQ==

114 UNDEFEATED BOUTS. (This is if you count street fighting or Bare-Knuckle Boxing ... (BKB ) ) There are at least 13 BKB Boxers on this list, none with a record to beat this one though.

1. Jimmy Barry - World Paperweight Champion (110lbs) - 58 (38) - 0 (0) - 10

2. Benjamin Brain - English Bareknuckle Heavyweight Champion - (7-0-1)

3. Tom Chandler - Middleweight Bareknuckle Champion - (3-0-1)

4. William "Nobby" Clark - Featherweight Bareknuckle Champion - (2-0-0)

5. Jim Dunne - Welterweight Bare Knuckle Champion - (2-0-0)

6. Jack "Duggan" Fearns - English Bare Knuckle Heavyweight Champion - (1-0-0)

7. Samson Dutch Boy Gym - WBF Super Flyweight Champion - 43 (36)

• 0(0) - 0

8. Owney Geoghegan - American Lightweight Bareknuckle Champion - (11-0-1)

9. Jack Harris - English Heavyweight Claimant BareknuckleChampion

10. Jemal Hinton - WBC Continental Americas Super Bantamweight Campion - 22 (17) - 0 (0) - 0

11. Jacob Hyer - Bare Knuckle American Heavyweight Champion - (1-0-0)

12. Tom Hyer - Bare Knuckle American Heavyweight Champion - (2-0-0)

13. Ike Ibeabuchi - WBC International Heavyweight Champion - 20 (15) - 0(0) - 0

14. Ji Won Kim - IBF Super Bantamweight Champion - 16 (7) - 0 (0) - 2

15. Michael Loewe - WBO Welterweight Champion - 28 (10) - 0(0) - 0

16. Ricardo Lopez - IBF Light Flyweight Champion - 51 (38) - 0 (0) - 1

17. Tom Lyons - Bare Knuckle Heavyweight Champion (1-0-0)

18. Rocky Marciano - World Heavyweight Champion - 49 (43) - 0(0)

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19. Terry Marsh - IBF Light Welterweight Champion - 26 (10) - 0 (0) - 1

20. Floyd Mayweather Jr. - WBC Super Featherweight, WBC Lightweight Champion, WBC Light Welterweight Champion, IBF Welterweight Champion, WBC Welterweight Champion & WBC Light Middleweight Champion - 39 (25) - 0- 0

21. Jack McAuliffe - World Lightweight Champion - 34 (23) - 0 (0) - 5

22. Young Mitchell - American Featherweight, Australian Lightweight,PC Welterweight, and PC Middleweight Claimant - 35-0-6 (BoxRec only has 5-0-4)

23. Edson Pedro Nascimento - UBC Ibero-American Lightweight Champion - 47 (40) - 0(0) - 1

24. Horace Notice - Commonwealth (BE) Heavyweight Belt-holder - 16 (12) - 0 (0) - 0

25. Sven Ottke - WBA & IBF Super Middleweight Champion - 34 (6) - 0 (0) - 0

26. Laszlo Papp - EBU (European) Middleweight Champion - 27 (15)

• 0 (0) - 2

27. Henry Pearce - Bare Knuckle Heavyweight Champion - (7-0-0)

28. Jack Randall - Lightweight Bareknuckle Champion - (16-0-1)

29. Young Dutch Sam - Welterweight Bareknuckle Champion - (11-0-0) ????????

30. Pichit Sitbangprachan IBF Flyweight Champion 24(18) - 0 (0)

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31. Mzukisi Skweyiya - South African Non-White Bantamweight Champion - 21 (7) - 0 (0) - 1

Some sources have Joe Coburn - Bare Knuckle Heavyweight Champion, BUT he was beaten twice during his career.

Here's some others that were Undefeated:

1. Kirk Daley - (1988-1994) Former Jr. Middleweight Contender - 19 (18) - 0 (0) - 0

2. Scott Daley - (1986-1998) Former Middleweight Contender - 24 (24) - 0(0) - 0

3. George Kandelaki - (1998-2003) Former Heavyweight Contender - 24 (18) - 0 (0) - 0

4. Vinny Letizia - (1990-1993) Former Welterweight Contender 16 (14) - 0(0) - 1

5. Tom Gleason - (1890-1896) Middleweight Champion of North & South Dakota, & Montana - 6-0-3 (2 ND)

6. Niels H Madsen - (1990-1992) Former Cruiserweight 8(4) - 0 (0) - 0

7. Agustin Senin - (1967-1972) Spanish & EBU (European) Bantamweight Champion - 42 (21) - 0 (0) - 1

8. Gurcharan Singh (2001-2004) Former Cruiserweight 17 (10) - 0(0) - 0

9. Jimmy Wilde (Moisés Ortenberg) - (1935-1943) Argentina - 37 (15) - 0 (0) - 5

10. Ricky Womack - (1984-2001) (defeated Holyfield 3 times in the amateur) 13(6) - 0 (0) - 1

There even more, BUT I don't think I have the room to put them all in.

Rocky Marciano is to this date the only undefeated heavyweight champion.

Warrior25bsc: What about Joe Calzaghe?