#4. Kamaru Usman vs. Leon Edwards - UFC welterweight division
The UFC has made it clear that this is the fight they'd like to make for Kamaru Usman's next title defense. Leon Edwards has put on a lengthy winning streak, dating all the way back to his last fight with Usman and has established himself as the top contender in the division.
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Their first encounter was early in both fighters' careers and, in truth, did not produce the most entertaining bout. However, both men have progressed hugely since then and a battle between the top welterweights in the division would be a highly anticipated matchup.
This one would rank higher if it weren't for the fact that most MMA analysts are anticipating that the rematch will likely produce a similar fight to the first. However, if Edwards is able to avoid being smothered by Usman's wrestling, he'd have the advantage in a stand-up battle.
#3. Marlon Vera vs. Sean O'Malley II
Sean O'Malley has already been a big draw in the UFC for some time. The one loss he has suffered came at the hands of Marlon 'Chito' Vera, so naturally there would be significant interest in a rematch. On top of that, both men have improved significantly and become top contenders in the bantamweight division.
O'Malley has not lost since this defeat and has produced three bonus-winning finishes since that bout. Vera did suffer a loss to Jose Aldo but has now also put together a streak of three bonus-winning victories that have led to him entering the top 5 at bantamweight.
While this fight is likely not the next step for each competitor, a rematch at some point down the line does seem likely. The first bout between the pair did have a fair amount of hype, but both men have gotten better and become more popular since. A rematch would now be substantially bigger than their first encounter.