Which professional sports does the athlete, born in 1977, who has defended the championship title as many times as the American professional mixed martial artist Stipe Miocic, play? 
Stipe Miocic:  Miocic has defended the belt twice, and by doing so has tied the record for most successful title defenses held with Randy Couture, Tim Sylvia, Brock Lesnar, and Cain Velasquez. Brock Lesnar: Brock Edward Lesnar ( ; born July 12, 1977) is an American professional wrestler and former professional mixed martial artist, professional American football player and amateur wrestler who is currently signed with WWE.
American football