The WBO sanctioned a bout between Eric Jamili ( 10-5-1 ) and Mickey Cantwell ( 13-4-1 ) to fill the vacancy despite protests by López.

After a few fights there, he met former world lightweight champion Ray " Boom Boom " Mancini, who had a record of 29-3 with 23 knockouts coming into this fight, for the vacant WBO Light Welterweight title.

When a WBO-recognized champion wished to fight for a WBC championship, he had to abandon his WBO title first, without any special considerations.

However, in 1993, the Don King promoted super-middleweight showdown between WBC champion Nigel Benn and WBO champion Chris Eubank was recognized as a title unification fight by the WBC.

In his twelfth professional fight, he won his first world title at age 20, stopping Jimmy Bredahl ( 16 – 0 ) in the tenth round to win the WBO Super Featherweight title.

He relinquished the IBF title and defended the WBO title against undefeated Genaro Hernandez ( 32 – 0 – 1 ), who relinquished the WBA Super Featherweight title to fight De La Hoya.

On May 7, 2011, Mosley lost the fight to Manny Pacquiao for the WBO Welterweight title at the MGM Grand in Las Vegas.

On November 14, 2010 he lost to Serhiy Fedchenko by unanimous decision in a fight in which was also disputed, for the vacant WBO European light welterweight title.

In his next fight, April 29, 1989, the WBO put him and former WBC featherweight champion Juan Laporte against each other for the vacant WBO super featherweight title.

He then won the WBO Featherweight title after beating Louie Espinoza ( in a rematch of their 1989 fight that ended in a draw ) by split decision.

After the McKinney fight, he defeated former WBO Champion Jesse Benavides by third round knockout.

After two more wins, he was given another opportunity to fight for a world title by the WBO.

Benn twice attempted to take the WBO super middleweight title from Steve Collins but failed in both attempts: losing by TKO in four in the first fight after sustaining an ankle injury.

He rolled through the competition en route to securing an opportunity to fight for the vacant WBO heavyweight championship the following year against Bert Cooper.

In his first defense of those belts, on November 5, 1994, Moorer faced 45-year old George Foreman, who lost his last fight to then WBO heavyweight champion Tommy Morrison.

The WBO later rescinded their sanctioning of this fight due to Tomashek's lack of experience.

In boxing, Oscar de la Hoya had a few of his early bouts at the arena, and Michael Carbajal also fought there, including winning the WBO world Junior Flyweight title from Josue Camacho in 1994, and Julio Cesar Chavez ended his career with a fight at the arena.

Arce was scheduled to fight Eric Morel ( 42 – 2 ; 21 KO ) of Puerto Rico on June 26, 2010 at the Alamodome in San Antonio, Texas, United States with the Interim WBO Bantamweight title at stake.

Santos then vacated the WBO title to go up in weight and pursue the WBO Light Middleweight Championship and Margarito was assigned to fight Antonio Díaz for the vacant title in front of an HBO Boxing audience.

A rematch was quickly arranged for three months later and they again fought for the WBO cruiserweight championship in what turned out to be Eubank's last fight.

By the end of 1994, Hernández was clamoring for a world title fight against crosstown rival and WBO lightweight champion Oscar De La Hoya.

Michael Watson, MBE ( born 15 March 1965 in Hackney, London ) is a retired British boxer whose career ended prematurely as a result of near-fatal injury sustained in a WBO super-middleweight title fight defeat by Chris Eubank in September 1991.

Brewster lost his WBO title by unanimous decision on April 1, 2006 to Sergei Liakhovich from Belarus in an action-packed fight.

Promoters soon began arrangements for a bout between the WBC and WBO super bantamweight title holders.

Under Valcarcel's rule, the organization has been able to sign deals with the World Boxing Association, World Boxing Council and International Boxing Federation to hold unification bouts between WBO world champions and world champions from the other organizations.

In his sixth and final defense of the WBO lightweight title, he knocked out Jesse James Leija ( 30 – 1 – 2 ) in two rounds.

Showing resilience, Mugabi resurfaced with two more wins and once again found himself fighting for a world title, facing Gerald McClellan on November 20, 1991 in London for the vacant WBO middleweight championship.

On September 12, 2008, Vázquez, Jr. won his first professional championship, the WBO Latino super bantamweight title, before incorporating the WBA Fedecentro super bantamweight title to his résumé two months later.

After two more wins, against Sanderline Williams and Jose Quinones, Benn fought WBO middleweight title holder Doug DeWitt of the USA in Atlantic City.

After two wins in 1993, including one over two-time world title challenger Carl " The Truth " Williams, Morrison found himself fighting for the WBO title again, against heavyweight boxing legend George Foreman, who was himself making a comeback.

After winning two more fights, both times Romero retaining his world title by knockout, Romero and Tapia met to unify the IBF and WBO world Super Flyweight championships.

Current rankings list Dimitrenko as the number two contender for the WBO World Heavyweight title, which is held by Wladimir Klitschko.

Leija rebounded with two wins, including one over Jeff Mayweather, and then, on December 15, 1995, he received a chance at becoming world champion for the second time, when he challenged Oscar De La Hoya for De La Hoya's WBO lightweight title, at Madison Square Garden.

As well as being the first and ( so far ) only minimumweight to hold two different major titles simultaneously ( WBC and WBO ).

After two more wins, Medina got his second chance at becoming world featherweight champion for the fifth time against WBO champion Scott Harrison.

He is best known for working in Debenhams as a storeman in Cardiff, then with just two days notice, he accepted the fight against John Davison in 1993 for the vacant WBO Featherweight title and won the contest on a points decision.

Hide is a two-time world heavyweight champion, having held the WBO title twice including a reign of nearly two years from 1997 to 1999.

However, two of those belts ( WBA and IBF ) had been stripped from Dariusz Michalczewski, who had unified them with his WBO title by beating the Lineal champion Virgil Hill in June 1997, and subsequently remained unbeaten, defending his remaining belt until 2004.

He has had great success with fighters such as Miguel Cotto, who has won world titles at 140, 147 and 154 pounds, and Antonio Margarito, who held a 147-pound WBO belt from 2002 – 2007.

Among the fighters he defeated during that streak were Steve Zouski, Art Card, future WBO cruiserweight champion Johnny Nelson, and future world title challenger Bert Cooper.

Both fighters were celebrated for their decision to fight each other rather than bow to the pressure from what has become known as " The Alphabet Soup " sanctioning bodies ( WBC, WBA, WBO, and IBF ).

Some of his high-profile fights have ended in defeats for his fighters, including Lamon Brewster who lost his WBO title in a rematch to Wladimir Klitschko, ( IBF, WBO, Ring Magazine Heavyweight champion ), Antonio Tarver who lost to Bernard Hopkins, Tomasz Adamek who lost WBC title to Chad Dawson, Paulie Malignaggi who lost to Ricky Hatton ( which saw Malignaggi leave McGirt in search of a new trainer ), and Arturo Gatti who was KO'd by Floyd Mayweather Jr. and Carlos Baldomir.