6 matches for John Cena if he doesn't face Undertaker at WrestleMania 34

#2 A tag team match against Kevin Owens and Sami Zayn

Just stay united to take out Cena.

Anti-Authority storylines always work tremendously, and there is no one better at pulling one off than Cena.

Currently, Kevin Owens and Sami Zayn are on the verge of an authority storyline, although the current development of them suggests that they might be going against each other at WrestleMania, although it's definitely too early for them to break. The Shield, Nexus, Evolution, Legacy: all these factions lasted for years before disbanding themselves; evidently, the longer it stays, the hotter it breaks.

They have faced almost everyone in the Smackdown roster for a match to be considered at WrestleMania other than Cena. If they are to stick around and face Cena, then it better be a tag team match and not a handicap match. As far as Cena's partner is concerned, there are lots of talented guys in the locker room like Tye Dillinger and Sin Cara waiting breathlessly in the land of opportunity to partner him.