WNicola Adams is a British former professional boxer who competed from 2017 to 2019. She retired with an undefeated record and held the WBO female flyweight title in 2019. As an amateur, she became the first female boxer to become an Olympic champion after winning gold at London 2012, and the first double Olympic champion following a second gold medal at Rio 2016, both in the flyweight division. As of 27 May 2016 she was the reigning Olympic, World and European Games champion at flyweight, and won the entire set of amateur championships available to her - Olympic, Commonwealth and European Games' titles, and the World, European and European Union championships.
WLaila Amaria Ali is an American television personality and retired professional boxer who competed from 1999 to 2007. She is the daughter of Muhammad Ali and is the eighth of her father's nine children. During her career, from which she retired undefeated, she held the WBC, WIBA, IWBF and IBA female super middleweight titles, and the IWBF light heavyweight title.
WJames Curran Barry was an American boxer who held the world bantamweight championship from 1894 to 1899. Commonly referred to as "The Little Tiger", Barry retired undefeated with a record of 60–0–10. He was inducted into The Ring magazine Hall of Fame in 2000.
WJoseph William Calzaghe is a Welsh former professional boxer who competed from 1993 to 2008. He held world championships in two weight classes, including the unified WBA (Super), WBC, IBF, WBO, Ring magazine and lineal super-middleweight titles, and the Ring light-heavyweight title.
WMihai Leu also known as Michael Loewe is a Romanian former professional boxer who fought out of Hamburg, Germany. He is a former WBO Welterweight Champion.
WRocco Francis Marchegiano, better known as Rocky Marciano, was an American professional boxer who competed from 1947 to 1955, and held the world heavyweight title from 1952 to 1956. He is the only heavyweight champion to have finished his career undefeated. His six title defenses were against Jersey Joe Walcott, Roland La Starza, Ezzard Charles (twice), Don Cockell and Archie Moore.
WTerry Marsh is an English former professional boxer who was an undefeated world champion in the light welterweight division.
WFloyd Joy Mayweather Jr. is an American professional boxing promoter and former professional boxer. He competed between 1996 and 2015, and made a one-fight comeback in 2017. During his career he won fifteen major world titles including The Ring in five weight classes, the lineal championship in four weight classes, and retired with an undefeated record. As an amateur, Mayweather won a bronze medal in the featherweight division at the 1996 Olympics, three U.S. Golden Gloves championships, and the U.S. national championship at featherweight.
WJack McAuliffe was an Irish-American boxer who fought mostly out of Williamsburg, Brooklyn. Nicknamed "The Napoleon of the Ring," McAuliffe is one of only fifteen world boxing champions to retire without a loss. He was the World Lightweight champion from 1886 to 1893. He was inducted into The Ring Boxing Hall of Fame in 1954 and the International Boxing Hall of Fame in 1995.
WSven Ottke is a German former professional boxer who competed from 1997 to 2004. He was a unified super-middleweight world champion, having held the IBF title from 1998 to 2004, and the WBA (Super) title from 2003 to 2004. With 21 successful title defences, Ottke was the third European boxer to retire as an undefeated world champion, after Terry Marsh and Michael Loewe; Joe Calzaghe later became the fourth. Ottke defended the title against 20 boxers, a record in the super-middleweight division shared with Joe Calzaghe. As an amateur, Ottke won a bronze medal in the middleweight division at the 1989 World Championships.
WDmitry Yurievich Pirog is a Russian politician and former professional boxer who competed from 2005 to 2012. In boxing he held the WBO middleweight title from 2010 to 2012, and although his career was cut short due to a debilitating back injury, he is one of the few professional boxers to win a world title and retire undefeated. He is also credited as the only boxer to stop Danny Jacobs, dealing Jacobs his first professional defeat and effectively ending his 20–0 winning streak. Being the only Russian boxer ever to hold the WBO Middleweight Championship, he never made it to the quarterfinals of the Russian national amateur boxing championships.
WEdwin Valero was a Venezuelan professional boxer who competed from 2002 to 2010. He was an undefeated former world champion in two weight classes, having held the WBA super featherweight title from 2006 to 2008 and the WBC lightweight title from 2009 to 2010. A southpaw known for his highly aggressive fighting style and exceptional punching power, Valero remains the only champion in the 30-year history of the WBC to win every fight in his career by knockout. In 2010, Valero committed suicide in jail after being arrested on suspicion of killing his wife.
WAndre Michael Ward is an American former professional boxer who competed from 2004 to 2017. He retired with an undefeated record and held multiple world titles in two weight classes, including the unified WBA (Super), WBC, Ring magazine, and lineal super middleweight titles between 2009 and 2015; and the unified WBA (Undisputed), IBF, WBO, and Ring light heavyweight titles between 2016 and 2017. During his reign as light heavyweight champion, Ward was ranked as the world's best active boxer, pound for pound, by The Ring magazine and the Transnational Boxing Rankings Board (TBRB), as well as the world's best active boxer in the division by The Ring, the TBRB, and BoxRec. As of January 2021, BoxRec ranks Ward as the tenth greatest fighter of all time, pound for pound. Eight of his victorious fights received a 5-Star rating from BoxRec.