5 Rivalries still left for John Cena in WWE 

#2 John Cena Vs Finn Balor

Finn Balor and John Cena have only faced each other on the odd occasion on RAW

Finn Balor is one of the best performers today, and has the potential to be the greatest Superstar in WWE. The first ever WWE Universal Champion has all the tools required to be a top star in WWE, and has shown it in matches against the likes of AJ Styles, Seth Rollins and Braun Strowman.

While John Cena and Finn Balor did face each other in February, the match ended with John Cena beating Finn Balor clean. However, they never entered a proper feud back then.

Balor needs to enter a program with John Cena. Most importantly, a feud between Demon Balor and The Franchise is money. Not only would this feud be a dream come true for many fans, but it shall also undoubtedly help Balor ascend to the top of the heap.

Perhaps it could be a passing of the torch movement with Cena putting Finn Balor over, and raising Balor's hand in a show of respect.