4) Rey Mysterio vs. Kevin Owens
Kevin Owens is one of the few WWE Superstars who haven't had a major angle with Rey Mysterio. The former Universal Champion has built a reputation for his fantastic in-ring performances against a wide range of opponents.
Putting Owens against Mysterio just makes sense. The luchador always meshes well with big men, especially ones as versatile as KO. The latter needs an opposition who can impose a challenge.
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Owens could create a captivating story between him and Mysterio with the latter's history. The storytelling and in-ring skills will make for the best retirement match at WrestleMania 38.
3) Rey Mysterio vs. AJ Styles
When asked about dream WrestleMania opponents, Mysterio himself named AJ Styles. The Phenomenal One has a decorated resume and has put on show-stealers against the very best across multiple promotions.
Mysterio and Styles have met in the past, with Rey defeating AJ for the United States Championship. These two competitors have similar styles that can offer fast-paced action and an incredible encounter overall.
Styles could add a new accolade to his career by retiring the masked superstar at the Showcase of Immortals.