10 Things You Didn't Know About WWE WrestleMania 20

4. A WrestleMania Of Firsts

It may have been the twentieth WrestleMania in history, but 'Mania XX was still a night of firsts. 

The first match on the show, for example, was the first time the United States Championship had ever been defended at WrestleMania. Big Show defended the title against John Cena. 

When the Doctor of Thuganomics scored the pin he won his first title in WWE, too.

WrestleMania XX was also the first time the show was headlined by a triple-threat match. WrestleMania 2000 ended with a WWE Title fatal four-way, but this was the first three-way dance in the headline spot. 

All other WrestleMania main events to that point had been singles contests, besides the first WrestleMania which was main evented by a tag match. 

The finish to the main event gave us anothing first, as it was the first time in history that the WrestleMania main event had ended by submission, when Chris Benoit made Triple H tap out to the Cripper Crossface.