Victor-Ortiz-Floyd-Mayweather-2011-Getty-JOHN-GURZINSKI

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Floyd Mayweather Jr. slams a right to the head of WBC Welterweight Champion Victor Ortiz in the 4th round as referee Joe Cortez looks on, ending the fight on September 17, 2011 at the MGM Grand Garden Arena in Las Vegas. Mayweather beat Ortiz in a knockout to win the WBC Welterweight title. AFP PHOTO/JOHN GURZINSKI (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

The Transnational Boxing Rankings Board champions are the true lineal champions of each division, like in earlier years of boxing when there was only one champion per division. For more on lineal champions vs. titleholders, click the "boxing basics tutorial" tab at the top of the page.

Heavyweight (201+ lbs.): Tyson Fury

Cruiserweight (200): Mairis Briedis

Light Heavyweight (175): Artur Beterbiev

Super Middleweight (168): Saul Alvarez

Middleweight (160): Jermell Charlo

Junior Middleweight (154): Vacant

Welterweight (147): Vacant

Junior Welterweight (140): Josh Taylor

Lightweight (135): Devin Haney

Junior Lightweight (130): Shakur Stevenson

Featherweight (126): Vacant

Junior Featherweight (122): Guillermo Rigondeaux

Bantamweight (118): Naoya Inoue

Junior Bantamweight (115): Juan Francisco Estrada

Flyweight (112): Vacant

Junior Flyweight (108): Vacant

Strawweight (105): Vacant