#3 Samoa Joe

Cena has a long history with the Samoan Submission Machine. The two actually trained and competed against one another in the California based Ultimate Pro Wrestling in the early 2000s. UPW was associated with the WWE's developmental system back then, and it ultimately lead to Cena joining Ohio Valley Wrestling and later the main roster in 2002. Joe meanwhile spent years between the Indie Circuit, ROH, and Impact before making his way to NXT in 2015.
This is a match many in the WWE Universe have been hoping to see since Samoa Joe finally made his main roster debut in 2017. For one reason or another though it just has not come to fruition. It seemed like a possibility early on in 2018, but Joe ended up having to miss most of WrestleMania season due to injury. Joe is currently out of action with a broken thumb, but he should be back before next April.
A high profile feud and more importantly a major win on the "The Grandest Stage of Them All" is just what Joe needs to get his career moving in the right direction again. For the last couple years he just hasn't been able to break out, despite having all the tools to be a dominate force in the WWE. Regardless of the outcome, John Cena vs. Samoa Joe is a match we all deserve to see.