5 booking options for John Cena after No Mercy 

1.One final WrestleMania main event

Will John Cena Be Undertaker's Final Opponent On The Grandest Stage Of Them All?

John Cena was originally supposed to return to face The Undertaker back at WrestleMania 32. However, when he wasn't cleared in time, Shane McMahon was called in to take his place.

There were rumours that WWE was planning for the much-anticipated match to take place at this year's Survivor Series instead so that The Undertaker could walk away at the event he first debuted at 27 years ago.

WWE will want this match to take place in the future and since rumours suggest that Undertaker is preparing himself for a return to the ring following his hip surgery.

A match against John Cena would be a perfect one for The Phenom to go out on, and the WWE Universe will finally be given the nostalgic match they have been pining for.