#1 The Undertaker

The Undertaker's defeat to Roman Reigns at Wrestlemania earlier this year appeared to be his last wrestling match and though there hasn't been an official announcement by him or the company of his retirement, the reports indicate that The Deadman is done. Wrestling fans of this generation cannot expect a Mania without The Phenom and the WWE Universe would love to see him compete at least one final time at the Showcase of the Immortals.
The Undertaker is scheduled to appear on the 25th anniversary edition of Raw before the Royal Rumble, and fans are wishing it could sow the seeds for a potential in-ring return. John Cena also wishes to face The Phenom at the Grandest Stage of Them All as was highlighted in his jab at The Undertaker in a promo against Reigns.
John Cena's father just broke his silence on his heel turn! More details RIGHT HERE
A faceoff between the two biggest wrestlers in history at the biggest pay-per-view has never happened and is the only missing jigsaw piece in their illustrious careers.
Vince Mcmahon does what he thinks is best for business, and if he thinks Cena-Taker is in the best interests of the company, he could give the go-ahead for the dream match every wrestling fan wants. The Champ vs The Phenom at Mania has the potential to smash all the viewership records and could blow the roof off at the Mercedes-Benz Superdome in Louisiana.