The UCW-Zero Heavyweight Championship is the primary singles championship title in Ultra Championship Wrestling-Zero.
 It was first won by Blitz Mason in March 2003 and defended throughout the state of Utah, most often Salt Lake City, Utah, but also in the Rocky Mountains and the Southwest United States.
 The title was formerly recognized by AWA Superstars from 2005 to 2007, and then by the National Wrestling Alliance when the promotion became an NWA territory that same year.
 On February 26, 2011, the UCW-Zero Heavyweight Championship was around the waist of Los Mochis Paco until it was stolen by Tyler Cintron after Junior X attacked Paco.
 Later, Paco retrieved his belt back from Tyler Cintron.
 The following show however, Tyler Cintron walks into the ring with his own UCW-Zero Heavyweight Championship.
 UCW Director Blitz decide to make a Triple Threat TLC Match to determine the Undisputed UCW-Zero Heavyweight Champion which took place on June 4, 2011.
 Los Mochis Paco was the victor to become the Undisputed Heavyweight Champion.
 It would however be short lived because Los Mochis Paco was attacked by Black Out in the back and broke his leg and was unable to defend it.
 Two Weeks later on June 18, 2011, Director for the night and Former 4 time UCW-Zero Heavyweight Champion Martin Casaus made a Gauntlet Match to determine a New Champion.
 In the end, it was Junior X that prevailed and became the NEW UCW-Zero Heavyweight Champion.
 2011 Rocky Mountain Rumble Champion Kid Kade went on to win the UCW-Zero Heavyweight Champion after defeating Junior X at "Meltdown Mayhem" on August 13, 2011.
Donovan "Razor" Ruddock (born December 21, 1963) is a Canadian former professional boxer who competed from 1982 to 2001, and in 2015.
 A promising heavyweight of the late 1980s and early 1990s, Ruddock earned his nickname of "Razor" for his cutting jab, although he was better known for his powerful hybrid left hook/uppercut, which he called "The Smash".
 One of the best exhibitions of his left hand power was his brutal knockout of former WBA heavyweight champion Michael Dokes in 1990.
 Ruddock is also known for his two fights against Mike Tyson in 1991, and Lennox Lewis 1992.
The Fight of the Century (also known as The Fight) is the title boxing writers and historians have given to the boxing match between WBC/WBA heavyweight champion Joe Frazier (26–0, 23 KOs) and Ring magazine/lineal heavyweight champion
Bruce Samuel Seldon (born January 30, 1967) is an American former professional boxer who competed from 1988 to 1996, and 2004 to 2009.
 He held the WBA heavyweight title from 1995 to 1996, most notably losing to Mike Tyson via knockout in his second defense.
The fight between American boxer Muhammad Ali and Japanese professional wrestler Antonio Inoki was held at the Nippon Budokan arena in Tokyo on June 26, 1976.
 At the time, Ali had come off a knockout victory over Richard Dunn in May and was the reigning WBC/WBA Heavyweight Champion.
 Inoki, who had been taught the art of catch wrestling by legendary wrestler Karl Gotch, was staging exhibition fights against champions of various martial arts, in an attempt to show that pro wrestling was the dominant fighting discipline.
Brian Sidney Harper (born 19 June 1934), known professionally as Brian London, is an English retired heavyweight boxer.
 He was the British and Commonwealth heavyweight champion from 1958 to 1959, and twice challenged for the world heavyweight title, losing to Floyd Patterson in 1959 and Muhammad Ali in 1966, both times via knockout.
 He was one of a quartet of British boxers, with Henry Cooper, Joe Erskine, and Dick Richardson, who dominated the British boxing scene throughout the 1950s and 1960s.
The MCW Heavyweight Championship is a professional wrestling heavyweight championship owned by the MCW Pro Wrestling (MCW) promotion.
 The title was created and debuted on October 11, 1998 at a MCW live event.
 In 2003, MCW ceased operations; at its last show MCW Last Dance on July 16, the MCW Heavyweight Championship was unified with the FTW Heavyweight and the MEWF Heavyweight Championships, when then–MCW Heavyweight Champion Danny Doring defeated MEWF Heavyweight Champion Romeo Valentino and FTW Heavyweight Champion Chris Chetti.
 MCW reopened in 2005 and held its first show on October 1, 2005, titled Fort Meade Wrestling.
 The MCW Heavyweight Championship was reinstated on March 26, 2006 at MCW's The Phenomenal Final Four event, where Julio Dinero won a tournament to become the champion.
Alexander Muñoz (born February 8, 1979) is a Venezuelan professional boxer who has held the WBA super flyweight title twice; from 2002 to 2004, and from 2007 to 2008.
 He also challenged for the WBA bantamweight title in 2010.
 Muñoz's strong punching power earned him the nickname of "El Explosivo"; to date, 79% of his wins have come via knockout.
Joe "The Boss" Hipp (born December 7, 1962) is a retired professional Native American heavyweight boxer.
 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.
 In May 2009, he was inducted into the American Indian Athletic Hall of Fame.
Juan Carlos Giménez Ferreyra (born 20 December 1960) is a Paraguayan boxer.
 During his career he was WBC International light heavyweight champion and unsuccessfully fought for the World Super Middleweight title four times, first against Mauro Galvano in 1992, then against Chris Eubank the same year, against Nigel Benn in 1994 and finally against Joe Calzaghe in 1998, losing via knockout.

Question: To whom did this WBA heavyweight champion, that Joe Hipp challenged the championship for in 1995 as the first Native American, lose via knockout?
Answer: Mike Tyson