4,745 articles
Julio César Chávez Jr.
Julio César Chávez Jr. (Julio Cesar Chavez Jr.), born 1986 in Culiacán, is a Mexican boxer and son of Julio César Chávez, WBC middleweight champion 2011 to 2012, deported in 2025 to face cartel-related charges.
Julius Torma
Július Torma (1922–1991), Slovak boxer for Czechoslovakia, 1948 London Olympic welterweight gold medalist, first Czechoslovak Olympic boxing champion, 1949 European champion, later coach in Prague.
Junior dos Santos
Junior dos Santos, "Cigano" (born 1984), Brazilian UFC heavyweight champion 2011-2012 who won the title with a 64-second KO of Cain Velasquez at UFC on Fox 1; later fought in bare-knuckle MMA and MVP.
Junior Tafa
Junior Tafa, "The Juggernaut" (born 1996, Brisbane), Australian light heavyweight UFC fighter and former Glory kickboxer; pro MMA record 7-6-0 with all 7 wins by KO/TKO, younger brother of Justin Tafa.
Junkyard Dog
Junkyard Dog (Sylvester Ritter, 1952–1998), American pro wrestler and ex-college football star; Mid-South Wrestling's top draw, WWF star, first Wrestling Classic winner, 2004 WWE Hall of Fame inductee.
Jurg Rothlisberger
Jürg Röthlisberger (born 1955, Zürich) is a Swiss judoka, 1980 Moscow Olympic middleweight (−86 kg) champion and 1976 Montreal half-heavyweight bronze medallist; his gold is Switzerland's only Olympic judo title.
Jushin Liger
Jushin "Thunder" Liger (獣神サンダー・ライガー), ring persona of Keiichi Yamada, retired NJPW junior heavyweight wrestler (1984–2020), inventor of the Shooting Star Press, 11-time IWGP Junior Heavyweight Champion, 2020 WWE Hall of Fame inductee.
Jussier Formiga
Jussier Formiga (Jussier da Silva), Brazilian flyweight MMA fighter born 1985 in Natal; UFC record 9-7, pro 24-8, BJJ black belt, beat Figueiredo, released by UFC in 2020.
Justin Credible
Justin Credible is the ring name of American professional wrestler Peter Joseph Polaco, known for ECW and the WWF, where he first appeared as the masked Aldo Montoya.
Justin Gaethje
Justin Gaethje, "The Highlight" (born 1988, Safford, Arizona), American UFC lightweight champion and two-time interim titleholder; former WSOF champion; beat Ilia Topuria at UFC Freedom 250, June 14, 2026.
Justin Roberts
Justin Roberts (born 1979) is an American wrestling ring announcer, WWE announcer 2002–2014 (Raw, SmackDown, ECW, as "Jason Roberts") and AEW's ring announcer since 2019; author of Best Seat in the House.
Juventud Guerrera
Juventud Guerrera, son of Fuerza Guerrera, is a Mexican luchador who starred in AAA, ECW, WCW (Cruiserweight Champion, Filthy Animals), and WWE's Mexicools, and now runs his own promotion, Super X.
K-1
K-1, also known as K-1 kickboxing, is a Japanese kickboxing promotion founded in Tokyo in 1993 by karate practitioner Kazuyoshi Ishii, whose ruleset most international kickboxing promotions derive from.
K. D. Jadhav
K. D. Jadhav (Khashaba Dadasaheb Jadhav, "Pocket Dynamo"), Indian freestyle wrestler, 1948 and 1952 Olympics; won bantamweight bronze at Helsinki 1952, independent India's first individual Olympic medal.
Kaarlo Koskelo
Kaarlo Koskelo was a Finnish Greco-Roman wrestler who won featherweight gold at the 1912 Stockholm Olympics, then fought on the Red side of the Finnish Civil War.
Kaarlo Makinen
Kaarlo Mäkinen (Kaarlo Edvin Mäkinen, 1892–1980), Finnish freestyle wrestler, Olympic bantamweight gold at Amsterdam 1928 and silver at Paris 1924 behind Kustaa Pihlajamäki; also Greco-Roman Worlds silver 1921, bronze 1922; only Åland-born Finnish Olympic champion.
Kacy Catanzaro
Kacy Catanzaro, aka Katana Chance, American wrestler and former gymnast; first woman to complete an American Ninja Warrior City Finals course (2014); WWE 2017-2025, NXT and WWE Women's Tag Team Champion with Kayden Carter; released May 2025.
Kai Asakura (朝倉海)
Kai Asakura (朝倉海), born 1993, is a Japanese UFC bantamweight and former two-time RIZIN bantamweight champion who lost a flyweight title fight to Alexandre Pantoja in his UFC debut at UFC 310.
Kai Kara-France
Kai "Don't Blink" Kara-France (born 1993, Auckland) is a New Zealand UFC flyweight and City Kickboxing fighter, 25-12 (1 NC), who lost interim and undisputed flyweight title fights to Brandon Moreno (2022) and Alexandre Pantoja (2025).
Kai Stewart
Kai Stewart, "King" Kai Stewart, American bare-knuckle boxer and first ever BKFC featherweight (145 lb) champion; undefeated 10-0, six-time defending titleholder, former Montana high school wrestling state champion, born in Kansas, fights out of Montana.
Kairi Sane (那音琴 カイリ)
Kairi Sane (KAIRI), real name Kaori Hōsako, is a Japanese professional wrestler, 2017 Mae Young Classic winner, NXT Women's Champion, IWGP Women's Champion, and WWE Women's Tag Team Champion with Asuka in Damage CTRL.
Kaitlyn (wrestler)
Kaitlyn, ring name of Celeste Bonin (Celeste Beryl Bonin, born 1986), American bodybuilder and WWE wrestler 2010-2014; won NXT season three, Divas Champion 2013, left January 2014, founded Celestial Bodiez, returned for 2018 Mae Young Classic.
Kaito Ono (大野海人)
Kaito Ono (大野海人, KAITO), born 1997, is a Japanese kickboxer and shoot boxer from Osaka, former RISE Middleweight and SHOOT BOXING Welterweight Champion, 0-3 in ONE Championship including knockout losses to Grigorian and Siasarani.
Kajukenbo
Kajukenbo, a hybrid American martial art founded in 1947 at the Palama Settlement, Oahu, Hawaii, by five black belts including Adriano Emperado, combining karate, judo/jujitsu, kenpo, and Chinese boxing for street self-defense.
Kalaripayattu (കളരിപയറ്റ്)
Kalaripayattu (Kalarippayattu, കളരിപയറ്റ്) is Kerala's indigenous martial art combining body-control exercises, wooden and metal weapons, bare-hand combat, and marma-based healing, taught in four stages under a gurukkal.
Kali Reis
Kali Reis, also known as KO Mequinonoag, is an American boxer from Rhode Island who won six world titles and became the first Indigenous woman world boxing champion.
Kalisto (wrestler)
Kalisto (Emanuel Alejandro Rodriguez), also Samuray del Sol, is an American luchador, born in Chicago and raised in Mexico City; WWE NXT Tag Team Champion with Sin Cara, United States and Cruiserweight Champion.
Kalle Anttila
Kalle Anttila (Kaarlo Johan Jalmari Anttila, 1887-1949 or 1975), Finnish wrestler; first wrestler to win Olympic gold in two styles: 1920 freestyle lightweight and 1924 Greco-Roman featherweight, plus 1921-22 world titles.
Kamala (wrestler)
Kamala, ring name of James Arthur Harris (1950-2020), American wrestler billed as the Ugandan Giant; created by Jerry Lawler in Memphis in 1982, WWF title challenger to Hulk Hogan, USWA champion, WWE Hall of Famer.
Kamandar Madzhydau
Kamandar Madzhydau (Камандар Бафаліевіч Маджыдаў), also Madzhidov, born 1961, is a Belarusian Greco-Roman wrestler; 1988 Olympic featherweight champion for the USSR, 1986 and 1989 world champion, fourth at Atlanta 1996 for Belarus.