1. Muhammad Ali

The most lineal world heavyweight championship wins, with the most heavyweight world title recaptures.

2. Mike Tyson

The youngest world heavyweight champion, at 20 years and 145 days.

3. Joe Louis

The longest reigning heavyweight world champion, at 11 years and 252 days.

4. Floyd Mayweather Jr.

The highest career pay-per-view sales for a boxer, at $1.7 billion.

5. Manny Pacquiao
The most world titles in different weight divisions, with 8.

6. George Foreman
The oldest world heavyweight champion, at 45 years and 299 days.

7. Wilfred Benitez
The youngest world champion, at 17 years and 176 days.

8. Len Wickwar
The most professional bouts, with 472 bouts.

9. Archie Moore

The most knockout wins, at 145.

10. Reggie Strickland
The most professional defeats, at 276 losses.

References

Most lineal world heavyweight championship wins (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/431487-most-lineal-world-heavyweight-championship-wins (Accessed: November 1, 2022).

Most heavyweight world title recaptures, Boxing (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/64523-most-heavyweight-world-title-recaptures-boxing (Accessed: November 1, 2022).

Youngest world heavyweight boxing champion (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/64521-youngest-world-heavyweight-boxing-champion (Accessed: November 1, 2022).

Longest reigning World Heavyweight champion (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/longest-reigning-world-heavyweight-champion (Accessed: November 1, 2022).

Highest career pay-per-view sales for a boxer (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/100101-highest-career-pay-per-view-sales-for-a-boxer (Accessed: November 1, 2022).

Most consecutive world title fight wins at different weights (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/102595-most-consecutive-world-title-fight-wins-at-different-weights (Accessed: November 1, 2022).

Oldest heavyweight boxing world champion (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/64525-oldest-heavyweight-boxing-world-champion (Accessed: November 1, 2022).

Youngest boxing world champion (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/64501-youngest-boxing-world-champion (Accessed: November 1, 2022).

Most professional boxing bouts (male) (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/604108-most-professional-boxing-bouts-male (Accessed: November 1, 2022).

Most knockouts in a boxing career (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/64543-most-knockouts-in-a-boxing-career (Accessed: November 1, 2022).

Most losses by a professional boxer (no date) Guinness World Records. Available at: https://www.guinnessworldrecords.com/world-records/87377-most-losses-by-a-professional-boxer (Accessed: November 1, 2022).

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