Konstantin Borisovich "Kostya" Tszyu (/ˈkɒstə ˈzuː/; Russian: Константин Борисович «Костя» Цзю, IPA: [kənstɐnʲˈtʲin bɐˈrisəvʲɪtɕ ˈkosʲtʲə ˈdzːʲu]; born 19 September 1969) is a Russian-Australian former professional boxer who competed from 1992 to 2005. He held multiple world championships in the light-welterweight division, including the undisputed and lineal titles between 2001 and 2005. Tszyu was an exceptional all-around boxer-puncher who relied heavily on accuracy, timing, and carried formidable punching power; he is often regarded as one of the hardest-punching light-welterweights in the division's history.^[2]

Quick Facts Born, Nationality ...

Kostya Tszyu Костя Цзю
Tszyu in 2008
Born	Konstantin Borisovich Tszyu (1969-09-19) 19 September 1969 (age 54) Serov, Russian SFSR, Soviet Union
Nationality	Australian (since 1993) Soviet (until 1991)
Other names	Thunder from Down Under
Statistics
Weight(s)	Light-welterweight
Height	5 ft 7 in (170 cm)[1]
Reach	67 in (170 cm)[1]
Stance	Orthodox
Boxing record
Total fights	34
Wins	31
Wins by KO	25
Losses	2
No contests	1
Medal record Men's amateur boxing Representing  Soviet Union Goodwill Games 1990 Seattle Light-welterweight World Championships 1989 Moscow Lightweight 1991 Sydney Light-welterweight Junior World Championships 1987 Havana Lightweight European Championships 1989 Athens Lightweight 1991 Gothenburg Light-welterweight

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As an amateur, Tszyu represented the Soviet Union, winning a bronze medal in the lightweight division at the 1989 World Championships, and gold in the light-welterweight division at the 1991 World Championships. He also won consecutive gold medals at the 1989 and 1991 European Championships.

In 1995, Tszyu won his first of many professional world championships at light-welterweight—the International Boxing Federation (IBF) title—by defeating Jake Rodríguez. Five successful defences were made until an upset loss to Vince Phillips in 1997, which was Tszyu's first professional defeat. He would spend the next eight years undefeated, winning the vacant World Boxing Council (WBC) title in 1999 and the World Boxing Association (WBA) (Super version) title in 2001. Tszyu scored arguably his most famous win that year, when he knocked out Zab Judah to reclaim the IBF title, as well as the vacant Ring magazine and lineal titles, thus becoming the first undisputed light-welterweight champion in over 30 years. In 2005, in what would be his final fight, Tszyu was stopped by Ricky Hatton.

Tszyu is considered by many in Australia to be a national sports hero.^[3] In The Ring's March 2010 issue, Tszyu was ranked as the number one light-welterweight of the 2000s decade. In December 2010, he was inducted into the International Boxing Hall of Fame for the Class of 2011. From 2012 to 2013 he coached professional boxers Alexander Povetkin, Denis Lebedev and Khabib Allakhverdiev.^[4] In 2023, his son Tim Tszyu won the World Boxing Organization (WBO) junior-middleweight title.

Tszyu was born in Serov, a town near the Ural Mountains, in the former Soviet Union to a Korean (paternal)–Mongol (maternal) father and a Russian mother. Tszyu's father was a fitter in a metal factory, whereas his mother was a nurse.^[5]

As a child, Kostya was hyperactive, so his father decided to take him to a boxing gym, where he would channel that energy by fighting older boys.^[6] He impressed the Soviet amateur team coaches and he was sent to the Soviet Union's amateur boxing travelling training camps, where he visited more than 30 countries while training and fighting in tournaments. He trained with that group 250 days a year, and won various tournaments, such as amateur boxing's world championships. At the Cuban world championship tournament in 1987, he came in second place, and at the 1988 Summer Olympics, he lost in the third round.^[7]

Tszyu was a member of the Soviet Army, but since he was selected as an elite athlete, he was not required to serve the ordinary duty. He fought at the world championships once again, in Moscow in 1989, where he came in third place.

In 1991, he went again to the amateur world championships, this time held in Sydney. This was a trip that would change his life forever. Not only was the third time his charm, but he felt enchanted with the sights of Sydney and its people, and decided he wanted to live in Australia. Following the collapse of the Soviet Union in 1991, early the next year, Tszyu emigrated to Australia with his girlfriend, where they married in 1993 and became Australian citizens, settling in Sans Souci, Sydney. Before marrying her, though, Tszyu had already turned professional, beating Darrell Hiles by a knockout in one round on 1 March 1992, at Melbourne.

Tszyu started raising his quality of opposition almost immediately. In his fourth professional bout, he met the former WBC Featherweight Champion Juan Laporte, decisioning him over ten rounds. In his sixth bout, he beat contender Sammy Fuentes by a knockout in the first. Fuentes would go on to win a world title years after being handily beaten by Tszyu in 1993, Steve Larrimore, Larry La Crousiere and Robert Rivera, went to Australia to fight Tszyu, and none lasted more than two rounds. The only man to last more than two rounds with Tszyu in 1993 was Livingstone Bramble, a former World Lightweight Champion, who lost by decision to Tszyu at Newcastle, New South Wales.

In 1994, Héctor López, Angel Hernandez (who had just come off of a loss after challenging Julio César Chávez for the WBC belt), and Pedro Chinito Sanchez from the Dominican Republic tried to beat Tszyu, but Tszyu beat Lopez by a decision in ten, Hernandez by a knockout in seven, and Sanchez by a knockout in four. After the win against Sanchez, Tszyu was ranked number one in the light welterweight division.

Tszyu married Natasha Anikina on 24 September 1993.^[14] He has three children; Anastasia, Nikita and Tim. Nikita and Tim are both boxers.^[15] Tszyu initially moved with his family to Moscow in 2008, but they returned to Sydney, New South Wales, Australia.^[16] In September 2012, Tszyu left his family in Australia while he moved full-time to live in Russia.^[17] Tszyu is now married to Tatiana Averina, with whom he has two children, and runs a restaurant in Moscow.^[18]

Tszyu is an animal lover who owns several pets including Viking, a rottweiler who has been Tszyu's companion since he arrived in Australia; Jake, his pet diamond python; canaries and fish. Tszyu appeared with the animals on the pet show Harry's Practice in 2002.

Tszyu has been in several court battles with his managers. Most recently, his ex-manager Susie Bennell took him to court, alleging Tszyu owed her money. Tszyu was also ordered to repay $3.5 million to his former manager Bill Mordey in an unrelated civil suit.^[19] In journalist Paul Kent's biography of long time trainer Johnny Lewis, allegations were made that Tszyu had underpaid Lewis for his services. The dispute was settled out of court.