UFC 63: Hughes vs. Penn was a mixed martial arts event held by the Ultimate Fighting Championship on September 23, 2006. The event, originally subtitled "Hughes vs. St. Pierre," was scheduled to feature a UFC Welterweight Title match between champion Matt Hughes and Georges St.-Pierre. Nevertheless, a groin injury—which was reported early in August—forced St.-Pierre off the card.

UFC 63: Hughes vs. Penn

UFC 126: Silva vs. Belfort was a mixed martial arts pay-per-view event held by the Ultimate Fighting Championship on February 5, 2011, at the Mandalay Bay Events Center in Las Vegas, Nevada.