Gennadiy Gennadyevich Golovkin, often known by his nickname "GGG" or "Triple G", is a Kazakhstani professional boxer. He has held multiple middleweight world championships, and is a two-time former unified champion. He held the World Boxing Association (WBA), World Boxing Council (WBC) and International Boxing Federation (IBF) titles at varying points between 2014 and 2023, and challenged once for the undisputed super middleweight championship in 2022. He is also a former International Boxing Organization (IBO) middleweight champion, having held the title twice between 2011 and 2023.
Hassan N'Dam N'Jikam is a French Cameroonian professional boxer. He has held two middleweight world championships; including the WBO title in 2012 and the WBA (Regular) title in 2017, and has challenged once for a super-middleweight world title in 2019.
Serhiy Vyacheslavovich Derevyanchenko is a Ukrainian professional boxer who has challenged three times for world middleweight titles; the IBF title in 2018; the IBF and IBO titles in 2019; and the WBC title in 2020. As an amateur, he won the bronze medal at middleweight at the 2007 World Amateur Boxing Championships.
Daniel Jacobs is an American former professional boxer who competed from 2007 to 2024. He held the World Boxing Association (WBA) middleweight title from 2014 to 2017, and the International Boxing Federation (IBF) middleweight title from 2018 to 2019. Nicknamed the "Miracle Man", Jacobs' career was almost cut short in 2011 due to osteosarcoma, a rare form of bone cancer. He went on to make a full recovery after spending 19 months out of the sport, meanwhile recovering from severe operation-induced injuries generally perceived as crippling.
Billy Joe Saunders is a British professional boxer. He is the first fighter from the Travelling community to win world championships in two weight classes, including the WBO middleweight title from 2015 to 2018 and the WBO super-middleweight title from 2019 to 2021. At regional level, he held the European, British, and Commonwealth middleweight titles between 2012 and 2015. Saunders represented Great Britain at the 2008 Olympics as an amateur, reaching the second round of the welterweight bracket. In the same year, he won gold at the EU Championships.
Santos Saúl Álvarez Barragán, commonly known as Canelo or Saúl Álvarez, is a Mexican professional boxer. He has held multiple world championships in four weight classes from light middleweight to light heavyweight, including unified titles in three of those weight classes and lineal titles in two. In 2021, Álvarez became the first and only boxer in history to become the undisputed champion at super middleweight, holding this distinction until July 2024. He has also held the Ring magazine super middleweight title since 2020.
David Lemieux is a Canadian former professional boxer who competed from 2007 to 2022. who held the IBF middleweight title in 2015.
Osumamu Adama is a Ghanaian professional boxer in the middleweight division, and the first middleweight titleholder from Ghana.
Ryōta Murata is a Japanese former professional boxer who competed from 2013 to 2022. He held the WBA (Regular) middleweight title twice between 2017 and 2021, and the WBA (Super) middleweight title from 2021 to 2022. As an amateur, he won a silver medal at the 2011 World Championships, and gold the following year at the 2012 Olympics.
Janibek Alimkhanuly is a Kazakh professional boxer and unified middleweight champion who has held the WBO title since 2022, and the IBF title since October 2023. As an amateur, he won gold medals at the 2013 World Championships, 2013 Asian Championships and 2014 Asian Games. He also represented Kazakhstan at the 2016 Summer Olympics in the middleweight division, losing in the quarter-finals. He won the WBO Interim middleweight title on May 21, 2022, before being elevated to full champion on August 30, 2022, and he then won the IBF title on October 14, 2023.
Maciej Sulęcki is a Polish professional boxer who challenged for the WBO middleweight title in 2019.
Canelo Álvarez vs. Gennady Golovkin, billed as Supremacy, was a professional boxing match contested for the unified WBA (Super), WBC, IBF, IBO, Ring magazine, and lineal middleweight championship. The bout was on September 16, 2017, at T-Mobile Arena on the Las Vegas Strip. It was televised on HBO pay-per-view in the United States, on BoxNation Box Office in the United Kingdom, and on Space in Latin America.
Gennady Golovkin vs. Daniel Jacobs, billed as Middleweight Madness, was a professional boxing fight contested for the unified WBA (Super), WBC, IBF, IBO championship. The bout was on March 18, 2017 at Madison Square Garden in New York City, New York. It was televised on HBO pay-per-view in the United States, and on BoxNation in the United Kingdom.
Canelo Álvarez vs. Gennady Golovkin II billed as Final Judgment, was a professional boxing rematch between Canelo Álvarez and Gennady Golovkin which took place at T-Mobile Arena in Paradise, Nevada on September 15, 2018. Alvarez won by majority decision.
Jaime Aarón Munguía Escobedo is a Mexican professional boxer. He held the WBO junior middleweight title from 2018 to 2019.
Ivan Baranchyk is a Belarusian professional boxer who held the IBF light-welterweight title from 2018 to 2019.
Vergil Ortiz Jr. is an American professional boxer. He has held the World Boxing Council (WBC) interim super welterweight title since August 2024.
Michał Cieślak is a Polish professional boxer. He has challenged for the WBC cruiserweight title in 2020 and the WBO cruiserweight title in February 2022. As of June 2020, he is ranked as the world's eighth best active cruiserweight by the Transnational Boxing Rankings Board, ninth by BoxRec and tenth by The Ring.
Gennady Golovkin vs. Ryōta Murata, billed as Big Drama in Japan, was a middleweight unification professional boxing match contested between IBF and IBO champion, Gennady Golovkin and WBA (Super) champion, Ryōta Murata. The bout took place at Saitama Super Arena, Saitama, Japan on April 9, 2022.
Canelo Álvarez vs. Gennady Golovkin III, billed as The Trilogy, was a professional boxing match contested between undisputed super middleweight champion, Canelo Álvarez, and unified middleweight champion, Gennady Golovkin, with Álvarez's super middleweight titles on the line. The fight took place on September 17, 2022.
Chris Eubank Jr 
Kingdom Arena, Riyadh, Saudi Arabia
Abel Mina
Opera i Filharmonia Podlaska, Bialystok, Poland
Omir Rodriguez
Nizar Trimech
Vladyslav Gela
Sasha Yengoyan
Jaime Munguía 
Don Haskins Center, El Paso, Texas, U.S.
Gennady Golovkin 
Edwin Palacios
Ruben Diaz
Alessandro Goddi
Jose Antonio Villalobos
Kassim Ouma 
Patrick Mendy 
Arthur Hermann
Ivica Gogosevic
Ismail Teboev
Dzianas Makar
Janos Lakatos