To whom did this WBA heavyweight champion, that Joe Hipp challenged the championship for in 1995 as the first Native American, lose via knockout?
Joe Hipp:  A member of the Blackfeet Tribe, he became the first Native American to challenge for a world heavyweight boxing championship on August 19, 1995 when he fought WBA champion Bruce Seldon at the MGM Grand Garden Arena. Bruce Seldon:  He held the WBA heavyweight title from 1995 to 1996, most notably losing to Mike Tyson via knockout in his second defense.
Mike Tyson