The WBO’s latest ratings update – released February 26 – includes the installation of six new No. 1 contenders.

At heavyweight: The February 22 card in Riyadh, Saudi Arabia, led to a shakeup of the WBO’s heavyweight rankings. 

Zhilei Zhang (previously No. 1) lost to Agit Kabayel. Martin Bakole (previously No. 2) came in as a very late replacement and was stopped by Joseph Parker. Kabayel, by beating Zhang, won the WBC’s interim heavyweight title and therefore exited the WBO’s rankings.

All of which led to Justis Huni moving from No. 4 to No. 1, followed by upgrades for Moses Itauma (now No. 2) and Fabio Wardley (now No. 3), while Zhang has dropped to No. 4.

Oleksandr Usyk has the WBO heavyweight title, as well as the WBA and WBC belts. Parker remains the WBO interim titleholder.

At light heavyweight: The main event on February 22 saw Dmitry Bivol win his rematch, and the undisputed light heavyweight championship, with a majority decision over Artur Beterbiev. Bivol was previously No. 1, a position that now belongs to Beterbiev.

The WBO’s new interim titleholder is Callum Smith, who defeated Joshua Buatsi for that belt on the undercard. Buatsi is now ranked No. 4.

At welterweight: Shakhram Giyasov dropped for some reason from No. 1 to No. 3. That allowed Alexis Rocha, previously No. 2, to move up to No. 1. Rocha fought in December, settling for a draw with Raul Curiel (currently ranked No. 15).

The WBO welterweight titleholder is Brian Norman Jnr.

At junior welterweight: On February 15, Arnold Barboza (previously No. 1) defeated Jack Catterall (previously No. 2) for the WBO’s interim title at 140lbs. With the top spot vacant and Catterall dropping to No. 3, Alfredo Santiago moved up from No. 3 to No. 1.

The WBO and lineal welterweight champion is Teofimo Lopez.

At lightweight: Keyshawn Davis, previously ranked No. 1, dethroned Denys Berinchyk on February 14 for the WBO title. That meant Davis’ Top Rank stablemate, Raymond Muratalla, moved up from No. 2 to No. 1. 

However, that may not last long if Muratalla moves forward with a fight against Zaur Abdullaev for the IBF’s interim title; fighters tend to be dropped from the rankings if they compete for another sanctioning body’s belt.

Berinchyk is now ranked No. 5.

At junior featherweight: Sam Goodman was dropped from No. 1 to No. 2 after twice suffering cuts and having to pull out of fights with Naoya Inoue, who holds all four world titles at 122lbs. That allowed Carl Jammes Martin to move from No. 2 to No. 1.

The WBO’s titleholders and No. 1 contenders in each weight class are:

Heavyweight: Oleksandr Usyk has the WBA, WBC and WBO world titles; Joseph Parker has the interim belt; Justis Huni is the No. 1 contender.

Cruiserweight: Gilberto Ramirez has the WBA and WBO world titles; Michal Cieslak is the WBO’s No. 1 contender. 

Light heavyweight: Dmitry Bivol has all four world titles; Callum Smith is the WBO interim titleholder; Artur Beterbiev is the WBO’s No. 1 contender.

Super middleweight: Saul “Canelo” Alvarez has the WBA, WBC and WBO world titles; Diego Pacheco is the WBO’s No. 1 contender. Canelo is scheduled to face IBF titleholder William Scull on May 3 for the undisputed championship.

Middleweight: Janibek Alimkhanuly has the IBF and WBO world titles; Denzel Bentley is the WBO’s No. 1 contender.

Junior middleweight: Sebastian Fundora has the WBC and WBO world title; Terence Crawford is the WBO interim titleholder (and the primary WBA titleholder); Xander Zayas is the WBO’s No. 1 contender. Fundora is scheduled to defend against Chordale Booker on March 22.

Welterweight: Brian Norman Jnr has the world title; Alexis Rocha is his No. 1 contender.

Junior welterweight: Teofimo Lopez Jnr has the world title; Arnold Barboza is the WBO interim titleholder; Alfredo Santiago is the WBO’s No. 1 contender. 

Lightweight: Keyshawn Davis has the world title; Raymond Muratalla is his No. 1 contender. 

Junior lightweight: Emanuel Navarrete has the world title; Charly Suarez is his No. 1 contender. 

Featherweight: Rafael Espinoza has the world title; Bruce Carrington is his No. 1 contender. 

Junior featherweight: Naoya Inoue has all four world titles; Carl Jammes Martin is the WBO’s No. 1 contender.

Bantamweight: Yoshiki Takei has the world title; Christian Medina is his No. 1 contender.

Junior bantamweight: Phumelele Cafu has the world title; Roman Gonzalez is his No. 1 contender.

Flyweight: Anthony Olascuaga has the world title; Juan Carlos Camacho is his No. 1 contender

Junior flyweight: Shokichi Iwata has the world title; Regie Suganob is his No. 1 contender.

Minimumweight: Oscar Collazo has the WBA and WBO world titles; Victorio Saludar is the WBO’s No. 1 contender.

David Greisman, who has covered boxing since 2004, is on Twitter @FightingWords2 and @UnitedBoxingPod. He is the co-host of the United Boxing Podcast. David’s book, “Fighting Words: The Heart and Heartbreak of Boxing,” is available