WrestleMania XXX hype could begin on WWE television any day, now. For all intents and purposes, it may have already and the fanbase is just currently unaware. The rivalries that will define next April's "Show of Shows" are sure to capture our collective imaginations, laying the groundwork for the memories to be made at what should be one of the greatest WrestleManias of all-time if the spectacle that the anniversary label suggests holds up to past standards. So, what would it take to accomplish such an historic WrestleMania? It begins with the main-event. The top match on the card, the majority of the time, is the bout most likely to leave the greatest impression on the fans. This year, there is a clear cut, #1 option for the WrestleMania XXX main-event: John Cena vs. Undertaker. Here are five reasons why John Cena challenging Undertaker's illustrious undefeated Streak is the best choice for the main-event at WrestleMania XXX...