4,745 articles
Oleksandr Khyzhniak
Oleksandr Khyzhniak (Олександр Хижняк), Ukrainian boxer born 1995 in Poltava; Tokyo 2020 middleweight silver medalist, Paris 2024 80 kg Olympic gold medalist, 2017 world and European champion, professional since 2026.
Oleksandr Usyk
Oleksandr Usyk (El Gato, The Cat), Ukrainian southpaw boxer born in Simferopol; Olympic gold 2012, undisputed cruiserweight champion 2018, undisputed heavyweight champion 2024, unbeaten at 23-0 with 14 KOs.
Oleksandr Usyk vs. Daniel Dubois II
Oleksandr Usyk vs. Daniel Dubois II, the July 19, 2025 Wembley rematch, saw Usyk win by fifth-round KO to regain the IBF belt and again become undisputed heavyweight champion.
Oleksandr Usyk vs. Tyson Fury II
Oleksandr Usyk vs. Tyson Fury II, the Riyadh rematch of 21 December 2024, saw Usyk beat Fury by unanimous decision (116-112 three times) to retain the WBC, WBO, and WBA heavyweight titles.
Olena Kravatska
Olena Kravatska (Олена Віталіївна Кравацька), Ukrainian sabre fencer born 1992 in Chernivtsi; Olympic team sabre gold at Paris 2024 and silver at Rio 2016, junior world champion 2010.
Olga Knyazeva
Olga Nikolayevna Knyazeva (Ольга Николаевна Князева, 1954–2015), Soviet foil fencer from Kazan; 1976 Olympic team gold, 1975 FIE fencer of the year, four world team titles, later a coach in Kazan.
Olha Kharlan
Olha Kharlan (Ольга Харлан), Ukrainian sabre fencer born 1990; six Olympic medals including team golds 2008 and 2024, four-time individual world champion, disqualified in 2023 for refusing a Russian opponent's handshake.
Olha Zhovnir
Olha Zhovnir (Ольга Богданівна Жовнір, born 1989) is a Ukrainian right-handed sabre fencer, 2008 Beijing Olympic team sabre gold medalist, and multiple World and European team medalist for Ukraine.
Oliver Kirk
Oliver Kirk (Oliver Leonard Kirk, 1884-1960), American boxer, only Olympic boxer to win two golds in separate weight classes at one Games, taking bantamweight and featherweight titles at the 1904 St. Louis Olympics; later a professional with a 4-8-1 record.
Oliver McCall
Oliver McCall, "The Atomic Bull" (born 1965, Chicago), American heavyweight boxer; WBC champion who upset Lennox Lewis by TKO2 in 1994, lost to Bruno, broke down in the 1997 rematch, and fought into his sixties.
Olivier Aubin-Mercier
Olivier Aubin-Mercier is a Canadian lightweight mixed martial artist from Montreal, a former national judo team member who went 7-5 in the UFC and won the PFL lightweight title in 2022 and 2023.
Olivier Lenglet
Olivier Lenglet (Olivier Serge Lenglet), born 1960, French épée fencer; Olympic team gold 1988 Seoul and silver 1984; world team titles 1982, 1983; not the footballer Clément Lenglet.
Olle Anderberg
Olle Anderberg (1919–2003), Swedish wrestler, 1948 Olympic silver in Greco-Roman featherweight and 1952 Olympic gold in freestyle lightweight; three world titles, two European titles, UWW Hall of Fame 2009.
Omari Akhmedov (Омари Ахмедов)
Omari Akhmedov (Омари Ахмедов), "Wolverine", Russian middleweight MMA fighter born 1987 in Kizlyar, Dagestan; UFC 2013-2021 with 9-5-1 record, later PFL light heavyweight finalist; pro record 26-8-1.
Omid Norouzi
Omid Haji Norouzi (امید نوروزی), born 1986 in Shiraz, Iranian Greco-Roman wrestler; 2012 Olympic 60 kg gold medalist, 2011 world champion, 2014 world silver medalist, and 2010 Asian Games champion.
Omos
Omos (Tolulope Jordan Omogbehin), the Nigerian Giant, is a 7'3" Nigerian-born WWE wrestler and former college basketball player; Raw Tag Team Champion with AJ Styles, later NOAH GHC tag champion and AAA Copa Bardahl winner.
ONE Championship
ONE Championship (formerly ONE FC), founded 14 July 2011 in Singapore by Chatri Sityodtong and Victor Cui, is Asia's largest MMA, Muay Thai, kickboxing, and submission grappling promotion, known for hydration-tested weigh-ins, Prime Video US broadcasts, and a $1.35 billion valuation.
One Man Gang
One Man Gang (George Gray, born 1960), also Akeem the African Dream, American pro wrestler 1977-2009; Mid-South/UWF monster, WWF Twin Towers with Big Boss Man, WCW US Champion 1995.
Orange Cassidy
Orange Cassidy is the ring persona of American professional wrestler James Cipperly (born 1984), an AEW star known for a lazy act of slow-motion kicks and hands-in-his-pockets moves.
Oreste Moricca
Oreste Moricca (1891-1984), Italian fencer and general; won sabre team gold and épée team bronze at Paris 1924, later a judge at Berlin 1936 and Guardia di Finanza commander.
Oreste Puliti
Oreste Puliti (1891–1958), Italian fencer from Livorno, four-time Olympic team gold medalist in foil and sabre (1920, 1924, 1928), world foil champion 1927 and 1929, central figure of the 1924 Paris disqualification and subsequent duel with judge György Kovács.
Orkhonbayar Bayarsaikhan (Баярсайханы Орхонбаяр)
Orkhonbayar Bayarsaikhan (Баярсайханы Орхонбаяр, born 1998 in Selenge province) is a Mongolian Bökh wrestler who won all ten rounds at the 2026 State Naadam to become Grand Champion.
Orlando Jordan
Orlando Jordan (Orlando Mason Jordan, born 1974) is an American semi-retired professional wrestler, former WWE United States Champion as a member of JBL's Cabinet, and a 2010-2011 TNA wrestler whose openly bisexual character made him the first out bisexual wrestler in a major U.S. promotion.
Orlando Salido
Orlando Salido (Siri), Mexican boxer born 1980 in Ciudad Obregon, Sonora; multiple world featherweight and super featherweight champion (IBF, WBO), famous for beating Vasyl Lomachenko in 2014; retired 2017 at 44-14-4.
Orthodox stance
The orthodox stance is the standard fighting position in boxing, with the left foot and hand leading so the dominant right hand throws power punches; about 90% of boxers use it.
Ortiz (wrestler)
Ortiz (Miguel Molina, born 1991) is an American professional wrestler of Puerto Rican descent from Harlem, NY, signed to AEW; former LAX and Proud-N-Powerful tag team partner of Mike Santana.
Osamu Watanabe
Osamu Watanabe (渡辺長武), Japanese freestyle wrestler nicknamed "Animal"; 1962-63 world champion and unbeaten 1964 Tokyo Olympic featherweight gold medalist with a 186-189 match winning streak.
Oscar Bonavena
Oscar "Ringo" Bonavena (1942–1976), Argentine heavyweight boxer, twice fought Joe Frazier and lost by 15th-round TKO to Muhammad Ali in 1970; murdered at the Mustang Ranch brothel near Reno, Nevada.
Oscar Casanovas
Oscar Casanovas (Óscar Casanovas, 1914–1987) was an Argentine featherweight boxer who won gold at the 1936 Berlin Olympics, beating Charlie Catterall in the final, then acted in film and trained champions.
Oscar De La Hoya
Oscar De La Hoya, "the Golden Boy" (born 1973), American boxer and promoter; 1992 Olympic lightweight gold medalist, 10 world titles in six weight classes, founder of Golden Boy Promotions in 2002.