What's the most untarnished victory in heavyweight history?

People keep mentioning Foreman v Ali. Def can’t be that one as there is a ton of controversy behind that great win. The weather, the ropes being loosened, mystery bottle etc

 

There are numerous reports and recordings of the crowd with whom Ali was fraternizing, shouting "Ali booma ye." There are numerous reports of Foreman locking himself in a hotel room and wanting to get it over with as quickly as possible. It's hardly surprising.

The fight took place in extreme heat, which greatly favored Ali's style and was terrible for Foreman's. The loose ropes Ali was leaning on are a fact, because you surely don't think it's photoshopped? Furthermore, the tactic of leaning on the ropes is illegal—check the rules!

If a clear favorite loses, it's usually, and actually always, due to extraordinary circumstances. It could be an injury, lack of preparation, a unique style mismatch, sometimes a lucky punch.

If Foreman crushes Frazier and Norton: style made the fight. If Ali crushes Foreman – oh, the better fighter simply won.
No one has yet explained this beyond double standards.

 

Always thought this was pretty emphatic and straightforward

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Spinks had bad knees, was scared shitless, was old and a blown up light heavy and then cashed out. I don't necessarily agree but those are some excuses heard around them there hills.

Tyson-Berbick

 

Also came to say Tyson--Berbick.

 

What about Walcott's KO win over Charles or Robinson's KO over Fulmer?

 

Usyk - Joshua is unironically up there for lack of excuses. Prime heavyweight champion who was bigger, A side and on home turf lost to a smaller, older, lighter hitting fighter who came to away soil and won an uncontroversial decision. I can't think of a proper reason that even attempts to excuse Joshua's loss in anyway. That version of AJ would've still beat nearly any other heavy at that point in the division too.