#4 John Cena and Samoa Joe
A feud that definitely needs to happen before 2019 is John Cena Vs. Samoa Joe. While both competitors shared the same developmental brand, it was the Destroyer that encouraged Cena to join the WWE.
The Cenation Leader went on to become one of the most polarizing figures in sports entertainment, and while Joe ruled the independent circuits, both competitors shared a very good friendship outside of the industry.
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Considering that Cena's days as a professional wrestler are getting numbered, feuding with each other for the WWE Championship could be an incredible way to invoke anticipation among the fans.
Ever since their days in OVW, Cena and Joe have been good friends, and if the company acknowledges elements of such stature, then we could have a genuinely solid feud between the two.