#2 Steve Austin and Hulk Hogan
"Stone Cold" Steve Austin and "The Immortal" Hulk Hogan are major Superstars and they were also the faces of WWE during their respective times.
In 2002, Hulk Hogan returned to WWE with Scott Hall and Kevin Nash as the New World Order. WWE had plans for Austin to face Hogan at WrestleMania X8, a bout that would've seen two titans colliding.
The Rattlesnake, however, wasn't interested in having a match with The Hulkster, even admitting that he had a grudge against The Immortal One at that time. The match was scrapped and Hulk Hogan went on to have an epic clash with The Rock instead.
Stone Cold was pitted against Razor Ramon at the Show of Shows, who he defeated to win the match. The WWE Universe would've gotten a dream match between two of the biggest stars in the company's history.