#4 Rey Mysterio
Rey Mysterio has been one of WWE's most dependable and entertaining Superstars. Who can forget the run Mysterio had in the 2006 Royal Rumble where he lasted over sixty minutes to win, taking him all the way to WrestleMania where he became the World Heavyweight Champion.
Not too long ago, Mysterio assisted the debut of Cain Velasquez after Lesnar beat up Mysterio and his son. This led to the match between the two former UFC Heavyweight Champions at Crown Jewel. Once the match ended, Mysterio attacked Lesnar with a steel chair, resulting in Lesnar shifting to RAW in the pursuit of Mysterio.
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Lesnar had a score to settle with Mysterio, while the latter was seeking revenge for Lesnar hurting Dominick, Mysterio's son. These two locked horns at Survivor Series last year where Lesnar defeated Mysterio.
Now Mysterio is in the hunt for the US Title and is involved in some top-quality matches against Andrade. But WWE may always try to revive such rivalries or try to hit the fans with a sense of nostalgia, having Mysterio enter as the second entrant in the match. This is something that must be avoided at all costs.