I would say it’s more like Liston - Ali. Liston=Trump, Ali=DeSantis. DeSantis hasn’t won anything yet. Foreman was the champion in the Rumble in Jungle. In this political matchup, Trump is the GOP Champion. Liston was the champion. Whether or not DeSantis ‘shocks the world’, as Ali did, remains to be seen.
Trouble with that analogy is that Trump would never take a dive. The 2012 race would be a better comparison, with Romney as Liston.