En fotos: El Consejo Mundial de Boxeo celebrará 2,000 peleas de campeonato mundial

(Original Caption) "I'm the champ!" screams Cassius Clay as his handlers hug him joyfully after he defeated Sonny Liston for the heavyweight boxing title. Clay was credited with a 7th round TKO when Liston was unable to answer the bell because of a shoulder injury suffered in the first round.

CANADA - JUNE 20: Boxing: WBC Welterweight Title, Closeup of Roberto Duran (R) in action vs Sugar Ray Leonard (L) at Olympic Stadium, Montreal, CAN 6/20/1980 (Photo by Manny Millan/Sports Illustrated/Getty Images) (SetNumber: X24627)

Boxing: WBC/ WBA/ IBF Heavyweight Title: Mike Tyson down on canvas during bout vs James Buster Douglas at Tokyo Dome.Tyson is defeated by Douglas by 10th round knockout for his first professional loss. Tokyo, Japan 2/11/1990 CREDIT: Takeo Tanuma (Photo by Takeo Tanuma /Sports Illustrated/Getty Images) (Set Number: X39367 TK1 R8 F9 )

LAS VEGAS - SEPTEMBER 18,1999: Oscar De La Hoya (L) is hit with a right jab from Felix Trinidad during the fight at the Mandalay Bay Resort & Casino,on September 18,1999 in Las Vegas, Nevada. Felix Trinidad won the WBC welterweight title and IBF welterweight title by a MD 12. (Photo by: The Ring Magazine/Getty Images)

Boxing: WBA/WBC Heavyweight Title: George Foreman tries to get off the canvas as referee Zack Clayton checks on him during the match against Muhammad Ali at 20th of May Stadium. Kinshasa, Zaire 10/30/1974 CREDIT: Tony Triolo (Photo by Tony Triolo /Sports Illustrated/Getty Images) (Set Number: X19073 )

Boxing: WBC Light Welterweight Title: Julio Cesar Chavez (R) in action vs Meldrick Taylor during fight at Hilton Hotel. Las Vegas, NV 3/17/1990 CREDIT: John Iacono (Photo by John Iacono /Sports Illustrated/Getty Images) (Set Number: X39495 TK1 R12 F2 )

UNITED STATES - NOVEMBER 25: Boxing: WBC Welterweight Title, Sugar Ray Leonard (R) in action vs Roberto Duran (L) at Superdome, New Orleans, LA 11/25/1980 (Photo by Manny Millan/Sports Illustrated/Getty Images) (SetNumber: X25106 TK3)

LAS VEGAS, NV - MAY 02: Manny Pacquiao throws a left at Floyd Mayweather Jr. during their welterweight unification championship bout on May 2, 2015 at MGM Grand Garden Arena in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Sport, Boxing, World Heavyweight Championship, New York, pic: 8th March 1971, Joe Frazier, USA, left, led to a neutral corner by the referee after Frazier floored Ali in the 15th round, on his way to beating Muhammad Ali to retain the title, The epic fight ending with Frazier gaining a unanimous points victory (Photo by Rolls Press/Popperfoto/Getty Images)

20 Feb 1993: Julio Caesar Chavez throws a punch at Greg Haugen during a fight. Chavez won the fight. Mandatory Credit: Holly Stein /Allsport

LAS VEGAS, NV - SEPTEMBER 16: Gennady Golovkin punches Canelo Alvarez during their WBC, WBA and IBF middleweight championship bout at T-Mobile Arena on September 16, 2017 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 7: Diego Corrales lands a right on Jose Luis Castillo during their World Lightweight Unification bout on May 7, 2005 at The Mandalay Bay in Las Vegas, Nevada. Corrales won the fight after the referee stopped the fight in the tenth round. (Photo by Nick Laham/Getty Images).

19 Feb 2000: Marco Barrera swings to land a left punch during the WBC/WBO Super Bantamwight Championship against Erik Morales in Las Vegas, Nevada. Morales won by a decision in the 12th round. Mandatory Credit: Jed Jacobsohn /Allsport

(Original Caption) 8/21/1981-Las Vegas, NV- Puffy-eyed Wilfredo Gomez (L) looks dazed after being hit by defending champion Salvador Sanchez for the last time during eighth round action of their title bout. Referee Carlos Padilla stepped to stop the fight after this blow to the head of Gomez. Sanchez won in the eighth round TKO to retain his title.