2. The Undertaker
When you look back at the careers of The Rock and Undertaker, they obviously crossed paths many times. However, they never really had a long feud or one match that stands out. There were a couple of PPV matches, some other multi-man matches and also some on TV, but for the most part they really didn't have a rivalry. Part of it was because they were heels and babyfaces at the same time, but it was also a case of it simply not working out for whatever reason. In the case of Undertaker, we don't know how many matches he has left since he'll turn 50 years old next year. Perhaps he has an interest in working with an old friend like The Rock on the grandest stage of them all because it hasn't happened before. Following Undertaker's win over Brock Lesnar, what big names are really left for him? Maybe John Cena. It could be a younger guy like Bray Wyatt, but he may not be established enough for it. How about The Rock vs. The Undertaker at WrestleMania? It doesn't get much bigger than that. It's definitely possible.