#1 CM Punk vs. Roman Reigns
This is the biggest match CM Punk can have in WWE. While facing Roman Reigns is obviously huge for any returning star, there are quite a few layers to this potential story.
On the Art of Wrestling podcast, Punk stated that his original vision for The Shield did not involve Roman Reigns at all. He further mentioned how WWE officials constantly told him to "make Roman look strong."
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This was the first step towards fans turning on Reigns, which led to a few turbulent years for him as a babyface. But he has now fully recovered. The Big Dog became The Head of the Table and is currently on the run of a lifetime as a heel.
Roman Reigns is easily the biggest full-time star in WWE - something that CM Punk himself has stated. The feud between the two further digs into real life, with Reigns stating that he is willing to put business first if there is an opportunity for such a program.
Aside from the visible bad blood, we also have the Paul Heyman factor. Roman Reigns' special counsel has been associated with CM Punk. He was a major advocate of the 'Best in the World' and even managed him in 2013, before an intense break-up angle.
These multiple real-life elements make the story between Reigns and Punk a very exciting one, if the Straight Edge Superstar ever returns to WWE.