#3 The Undertaker vs Elias
WrestleMania 35 will go down as one of the rarest WrestleManias that The Phenom has not been a part of. Though The Undertaker didn't appear at WrestleMania 35, he did make an appearance the following night by interrupting Elias and taking him down on RAW.
While this might just have been a random segment to make use of The Undertaker and increase ratings, Elias might just be a great opponent for The Undertaker at the Saudi Arabia event next year. The Undertaker is all but confirmed to have some kind of a match at the show, and what better than to give a younger superstar like Elias the biggest match of his career.
#2 Samoa Joe vs Braun Strowman
Braun Strowman attacked the Samoan Submission Machine Samoa Joe on the SmackDown after WrestleMania 35, as the fans watched eagerly. Not only was he not a part of the blue brand at that point, his sudden attack kinda felt like "I'm coming for your title, Joe!"
Though we never saw anything between the two after that attack, even after Joe moving to RAW. But WWE might just be saving this big-money feud for the big event at Saudi Arabia. These two monsters clashing for the United States Title would be an epic rivalry and match for sure.