Top five Heavyweight Fights-Both fighters undefeated

[la-califa]

What would be the top five Heavyweight Championship fights in which both fighters were undefeated going into the fight.

[Drew101]

Ali-Frazier I
Foreman-Frazier I
Tyson-Spinks
Holyfield-Bowe I
Holmes-Cooney

And, though not a championship fight, Ibeabuchi-Tua deserves a mention

[OLD FOGEY]

What would be the top five Heavyweight Championship fights in which both fighters were undefeated going into the fight.


Sullivan-Corbett should be considered.

The only other major one prior to 1971 would be Marciano-LaStarza.