#1 WWE Men's Royal Rumble 2019

Original choice: The Rock, Ultimate winner: Seth Rollins
Seth Rollins picked up a deserving win at the WWE Royal Rumble event last year, where he outlasted 29 other Superstars to seal his WrestleMania berth. However, Roman Reigns' break played a massive role in that booking decision. As per WrestleVotes, WWE had plans for The Rock to return and win the Royal Rumble in 2019.
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After winning the match, The Brahma Bull would have challenged his cousin Roman Reigns for the WWE Universal Championship in the main event of WrestleMania 35. Unfortunately, The Big Dog's battle with Leukemia forced WWE to change the plans. Many fans felt that it was WWE's last chance to book The Rock in a WrestleMania match.
Given that The Rock is busy with his Hollywood projects, it is highly unlikely that we will be able to witness a match between him and Roman Reigns anytime soon.