#4 John Cena vs. Brock Lesnar
Arguably the two biggest stars since the Attitude Era, Brock Lesnar vs John Cena is always a must-watch event.
Their two biggest matches against each other over the last decade were at Extreme Rules 2012, The Beast Incarnate's first professional wrestling bout in nearly five years, and SummerSlam 2014. Cena and Lesnar split these two encounters. The two also have history together as they both trained in OVW (Ohio Valley Wrestling) and crossed paths frequently earlier in their careers on SmackDown.
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One final match between the two megastars would sell out a massive stadium. Cena vs Lesnar is a main event that does not require heavy promotion and it could be a perfect sendoff for the leader of Cenation.
#3 John Cena vs. Big E
Over the last couple of years, Big E has broken out as one of the most promising performers in professional wrestling. His WWE Championship win was well received and he looks set to be one of the company's marquee names going forward. He also has plenty of personality and would be an interesting foil for John Cena.
Both men are powerhouses and have performed amazing feats of strength. Seeing them collide in a main event would be spectacular.
If WWE decides to invest in Big E as one of its stars of the future, a program with Cena would go a long way towards establishing The New Day man as a big star.