10 Best WWE World Champion Vs. World Champion Matches

3. CM Punk Vs. John Cena - SummerSlam 2011

The events heading into John Cena and CM Punk's SummerSlam 2011 main event sure were compelling. 

First, Punk beat Cena in a thriller at Money in the Bank, only to make good on his promise to leave with the title and disappear from WWE. Then Rey Mysterio won a tournament to become the new WWE Champion in his absence, only for Cena to then challenge and beat him, leaving us right where we were a fortnight before. 

But then Punk returned, claiming to be the rightful champ, and the two were booked to settle the dispute at SummerSlam - with Triple H on hand as special referee in order to ensure the deal went down in the right way. 

It was a typically fantastic match between two men with unmatched chemistry. It was back and forth and creative and felt like it could end in anyone's favour at any moment. 

It escalated nicely down the closing stretch, until Punk hit a second GTS and pinned Cena, who had one foot on the rope (I smell a rematch) to become the undisputed WWE Champion...

...for a few minutes, before Kevin Nash - fresh from texting himself backstage - jumped the Second City-Saint and left him easy prey for an Alberto Del Rio cash-in. 

A confusing and dissatisfying finish, yes, but the match itself is good gravy.