3. John Cena
A couple of months ago, Cena was second only to Brock as the most probable opponent for the Undertaker but his recent involvement in The Authority storyline has made is less likely as the ultimate unification bout draws near (or the return of the aged Hulk Hogan). This isn't fantasy booking, but with HHH and Stephanie not really trusting Randy Orton as the 'face' of the company, and Cena inserting himself into the storyline, if Cena is victorious (or at the very least grabs back the WWE Championship at the expense of the Heavyweight title) then he is the chosen face for The Authority. Who could defeat them? Well, the man who defeated HHH at three Wrestlemania's for a start and with Kane as 'Director of Operations' then there is further history there. The problem is, Cena isn't turning heel anytime soon and the chance of him dropping any title before the big one is slim. It could still happen but the Cena story seems to be moving in a different direction now which, to be honest, is a shame.