By CompuBox

MOST CONSECUTIVE HEAVYWEIGHT TITLE DEFENSES

1. Joe Louis -- 25

2. Larry Holmes -- 19 (20 if you include the Marvis Frazier fight, which was unsanctioned by the IBF)

3. Wladimir Klitschko -- 15 (has 20 defenses in two title reigns)

4. Tommy Burns -- 11

5. Muhammad Ali -- 10 (has 19 total defenses in three reigns)

6 (tie). Vitali Klitschko -- 9 (has 12 defenses in three reigns)

6. (tie) Lennox Lewis -- 9 (has 14 defenses in three reigns)

6. (tie) Mike Tyson -- 9

6. (tie) Joe Frazier -- 9 (if one counts four NYSAC title defenses)

* As of April 26, 2014