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.
Lucian Bute is a Romanian-Canadian former professional boxer who competed from 2003 to 2017. He held the IBF super-middleweight title from 2007 to 2012, successfully making nine consecutive defenses and reaching a peak ranking of number one in the division by The Ring magazine.
Vanes Norikovich Martirosyan is an Armenian-American former professional boxer who competed from 2005 to 2018. He challenged twice for a light middleweight world title in 2013 and 2016, and once for unified middleweight world titles in 2018.
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.
Daniel Geale is an Australian former professional boxer who competed from 2004 to 2016. He held the unified WBA (Super) and IBF middleweight titles between 2011 and 2013, and the IBO middleweight title from 2007 to 2009. As an amateur boxer, Geale won a welterweight gold medal at the 2002 Commonwealth Games.
Sergiy 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. As of February 2021, he is ranked as the world's fourth best active middleweight by the Transnational Boxing Rankings Board, eighth by BoxRec and fourth by The Ring magazine.
Daniel Jacobs is a retired American professional boxer. 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.
Martin Murray is a British former professional boxer who competed 2007 to 2020. He held the WBA interim middleweight title from 2011 to 2014, the British and Commonwealth middleweight titles between 2010 and 2012, and challenged five times for a world title.
Santos Saúl Álvarez Barragán, commonly known as Canelo, 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. Álvarez is the first and only boxer in history to become undisputed champion at super middleweight, having held the World Boxing Association (WBA), World Boxing Council (WBC) and Ring magazine titles since 2020, and the International Boxing Federation (IBF) and World Boxing Organization (WBO) titles since 2021.
Dmitry Yurievich Pirog is a Russian politician and former professional boxer. In boxing he competed from 2005 to 2012, and held the World Boxing Organization (WBO) middleweight title from 2010 to 2012. Although his career was cut short due to a debilitating back injury, he is one of the few professional boxers to win a world championship and retire undefeated.
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.
Willie Monroe Jr. is an American professional boxer. He has challenged twice for a world title; first in 2015 for the WBA (Super), interim WBC, and IBO middleweight titles. In 2017, he challenged for the WBO middleweight title.
Gennady Golovkin vs. Kell Brook, was a professional boxing match for the unified WBC, IBF, and IBO middleweight titles. The bout was held on 10 September 2016, at the O2 Arena in London, England. The event was televised live on Sky Sports Box Office in the UK and HBO in the United States. Golovkin won the fight in round 5, after Brook's corner threw in the towel.
Darnell Lamont Boone is an American professional boxer. Despite having never challenged for a world title, Boone is notable for facing several future world champions throughout his career, from middleweight to light heavyweight. In 2004, he was the first to score a knockdown against undefeated Olympic gold medalist Andre Ward, who went on to win a unanimous decision over Boone. In 2010, Boone caused a major upset when he knocked out future world champion Adonis Stevenson, who later gained revenge by knocking out Boone in 2013. Boone also defeated Willie Monroe Jr. in 2011, who later challenged twice for a world title. Other world champions Boone has faced include Jean Pascal, Erislandy Lara, and Sergey Kovalev (twice).
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.
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.
J'Leon Love 
Gennady Golovkin 
Ballsaal Interconti-Hotel, Düsseldorf, Germany
Dionisio Miranda
Emmanuel Gonzalez
Elco Garcia
Richard Grant
Manu Ntoh
Jose Diaz