#2 It doesn't get bigger than Cena vs. The Undertaker
John Cena vs. The Undertaker is a contest that fans have longed for, for many years now. Perhaps the only other Undertaker match they've wanted more is the one with Sting. However, Sting is in no shape to compete and John Cena is. This is as big as it gets.
Despite the thrill of watching AJ Styles and Shinsuke Nakamura tear it up and the sheer magnitude of a match like Brock Lesnar vs. Roman Reigns, John Cena vs. The Undertaker feels like the main event, doesn't it? Even though there's no title on the line. If The Undertaker has to retire after a match, it needs to be this one.
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No match will ever live up to the hype of this one unless Sting made a comeback. Any Undertaker future match would pale in front of this one.