Artur Grigorian (born Atuiz Grigorjan; Armenian: Արթուր Գրիգորյան; 20 October 1967 in Tashkent, Uzbek SSR, Soviet Union) is an Uzbek professional boxer of Armenian descent.

Grigorian is a former WBO Lightweight Champion. He retained his lightweight belt for a record of 17 times (surpassing Roberto Duran's record of 12) and held his belt for seven years, six months and twenty days; nearly as long as record holder Benny Leonard held his lightweight title (7 years, 8 months).

Artur Grigorian was born on 20 October 1967 in Soviet Tashkent, Uzbek SSR to Armenian parents. Artur has a brother and sister. He also has a wife and three daughters.

Grigorian currently lives in Hamburg, Germany with his family and trains former WBC Middleweight Champion Sebastian Zbik.

Grigorian began boxing at the age of 11. He defeated Shane Mosley in the 1990 Goodwill Games in Seattle City.

Artur had a final amateur record of 361-23.

Trained by Fritz Sdunek, Grigorian began his professional career in 1994 and won eight consecutive bouts. On 23 July 1994, Grigorian defeated Turkish boxer Senturk Ozdemir by a fifth round technical knockout and won the vacant German International Lightweight title.

Ruslan Chagaev (Tatar Cyrillic: Руслан Шамил улы Чагаев, Latin: Ruslan Şamil ulı Çağaev; Russian: Руслан Шамилович Чагаев) born October 19, 1978 in Andijan, Uzbek SSR, Soviet Union) is an Uzbekistani former WBA heavyweight boxing champion of Tatar ethnicity. As an amateur boxer, he has won the Asian and World Championships in the heavyweight (81–91 kg) category.

Chagaev won the WBA title in 2007 with a majority decision victory over Nikolai Valuev, but was made "champion in recess" after he sustained an injury. He relinquished the title after failing to have a rematch with Valuev. In his next fight, Chagaev lost by stoppage to IBF, WBO and IBO Champion Wladimir Klitschko.

Chagaev, a two-time world amateur champion, defeated legendary Cuban boxer Félix Savón to capture the gold medal at the 1997 World Championships but was then stripped of his crown for having two professional fights prior to the championships. Chagaev was reinstated as an amateur the following year when the fights were declared exhibitions.

Acelino "Popó" Freitas (Portuguese pronunciation: [aseˈlĩnu poˈpɔ ˈfɾejtɐs]; born September 21, 1975) is a Brazilian boxer and a former world junior lightweight and lightweight champion. Freitas is also a state legislator for the state of Bahia.

His nickname, Popó, was given to him by his mother, after the sound that babies make while drinking milk. Freitas had a difficult childhood, often sleeping on a sandy floor at his house. Since early in his life, he dreamed of a better place to live for his family. A skilled soccer player, he was more inclined, however, towards the sport of boxing since an early age. Fellow Brazilian Eder Jofre, generally recognized as the greatest world champion to come out of that country, was one of Freitas' childhood heroes.

Freitas competed for his native country and won a lightweight silver medal at the Pan American Games 1995 in Mar del Plata.

After the Pan American Games he turned into a professional boxer on July 14, 1995, against Adriano Jose Soares. With his win by knockout in the first round that night, Freitas set off a streak of 29 knockout wins in a row, which places as one of the longest knockout wins streak in boxing history. His first 10 wins were against low level competition, but for fight number 11, he took on the much more experienced Edwin Vazquez, knocking him out in the seventh round.

Sebastian Zbik (born 17 March 1982 in Neubrandenburg) is a German professional boxer and the former WBC Middleweight Champion of the world. Zbik resides in Mecklenburg-Vorpommern.

Zbik won the interim WBC middleweight title against Italian Domenico Spada on 11 July 2009. He was given the full title in January 2011 when the WBC promoted Sergio Martinez to Emeritus champion.

Zbik lost his newly awarded WBC Middleweight Championship against undefeated Mexican Julio César Chávez, Jr. at Staples Center Los Angeles, California on 4 June 2011.

Raul Horacio Balbi (born October 7, 1973 in Buenos Aires, Argentina) is an Argentine professional boxer. Although Balbi currently competes in the light welterweight division, he is most notable for having won the WBA world lightweight title.

Balbi made his professional debut on November 19, 1993 in Mercedes, Corrientes, Argentina. Balbi made a victorious start to his career by knocking out Juan Bautista Sosa in the first round. One of the highlights of Balbi's early career came on June 3, 1995 when he beat Simon Canache to claim the South American lightweight title. The first loss of Balbi's career came on September 9, 1995 when he lost to Manuel Alberto Billalba via a ten round points decision, Balbi avenged this defeat later on in his career by beating Billalba twice.

On February 22, 1997 Balbi travelled to Hamburg, Germany to challenge the Uzbek champion Artur Grigorian for the WBO lightweight title. Balbi's challenge proved to be unsuccessful, as Grigorian scored an eleventh round technical knockout. After the fight Balbi returned to Argentina, where he put together a run of five wins before losing a split decision to Walter Hugo Rodriguez.