Jake - Ali won his Gold medal at Lightheavyweight so Foreman vs Frazier was the last time two Olympic Heavyweight Champions fought for the World Championship at Heavyweight. It's the only other time too isn't it?
I just said Olympic Gold medalists fighting for the heavyweight championship. I didn't specify heavyweight Olympic Gold medalists (at least I don't think so). To answer your question... yes, Foreman-Frazier would be the only such instance, to my knowledge.
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