10 Biggest WWE Superstars Never To Headline WrestleMania

2. CM Punk

The debate rages on over whether Punk was right in walking out of the WWE because of their refusal to grant him a WrestleMania main event slot, but it would take an extremely harsh critic to deny the fact that he would have taken full advantage of such an opportunity. With the right opponent, nobody in the promotion could drum up as fanatical crowd support as CM Punk - and he had the ring skills to back it up. His renowned stamina and technical prowess would have allowed for an epic back-and-forth encounter, one befitting the biggest match of the year. Most Likely Opponent: As a face, John Cena. Would anybody complain about a re-hash of their legendary 2011 clash on a larger scale, complete with subtle callbacks and explicit references to the original feud. As a heel, Daniel Bryan. Imagine the plucky fan favourite finally getting his hands on the WWE Championship again, only to be ambushed by a returning Punk. It would never happen these days, but it's no crime to dream.