Context_1 : Nigel Gregory Benn (born 22 January 1964) is a British former professional boxer who competed from 1987 to 1996. He is a two-weight world champion, having held the WBO middleweight title in 1990, and the WBC super-middleweight title from 1992 to 1996. Additionally he held the Commonwealth middleweight title from 1988 to 1989. Nicknamed "The Dark Destroyer" for his formidable punching power and aggressive fighting style, Benn is ranked by BoxRec as the fourth best British super-middleweight boxer of all time. Context_2 : Ran Nakash (born 1978, Haifa) is an Israeli cruiserweight boxer. He is currently Chief Commander and Head Instructor of the Israel Defense Forces Krav Maga Instructional Division and holds a professional boxing record of 26 wins with 18 by knockout and one loss. He scored his latest victory on January 21, 2012 defeating Derek Bryant by unanimous decision. His only loss to date occurred on April 2, 2011 against WBO Cruiserweight champion Marco Huck. Despite accepting the fight on short notice as a late replacement for Giacobbe Fragomeni, Nakash fought a competitive fight, pressing his opponent throughout the 12-round bout, though Huck was ultimately awarded the victory on points. Context_3 : Avetik Abrahamyan (Armenian: Ավետիք Աբրահամյան ; born 20 February 1980), best known as Arthur Abraham, is an Armenian-German professional boxer. He is a three-time former world champion in two weight classes, having held the IBF middleweight title from 2005 to 2009 with ten successful defenses (the fourth most in middleweight history), and the WBO super-middleweight title twice between 2012 and 2016. Abraham is particularly known for his excellent chin, tight defence, and punching power. Context_4 : Sergio Gabriel Martínez (born February 21, 1975) is an Argentine former professional boxer who competed from 1997 to 2014. He held the unified WBC, WBO, "Ring" magazine, and lineal middleweight titles between 2010 and 2014, making six successful defenses of the latter two titles. Martínez's 50-month reign as lineal champion ranks as one of the longest in middleweight history. He also fought at light middleweight, where he held the IBO title from 2003 to 2005, and the WBC interim title in 2008 (later elevated to full world champion status the following year). Context_5 : Ivanson Ranny "Johnny" Nelson (born 4 January 1967) is a British former professional boxer who competed from 1986 to 2005. He is currently the longest reigning cruiserweight world champion of all time, having held the WBO title from 1999 to 2005, making thirteen successful defences, a record shared with Marco Huck. Nelson also held the British cruiserweight title twice, from 1989 to 1990 and 1996 to 1997; and the European cruiserweight title twice, from 1990 to 1992 and 1997 to 1998. Context_6 : Joseph William Calzaghe, {'1': ", '2': ", '3': ", '4': "} ( ; born 23 March 1972) is a Welsh former professional boxer who competed from 1993 to 2008. He is a two-weight world champion, having held the unified WBA (Super), WBC, IBF, WBO, "Ring" magazine, and lineal super-middleweight titles, as well as the "Ring" light-heavyweight title. Calzaghe is the longest-reigning super-middleweight world champion in boxing history, having held the WBO title for over 10 years and making 21 successful defences before moving up to light-heavyweight. As his super-middleweight and light-heavyweight reigns overlapped, he retired with the longest continual time as world champion of any active fighter. Context_7 : Christopher Cornelius "Chris" Byrd (born August 15, 1970) is an American former professional boxer who competed from 1993 to 2009. He is a two-time world heavyweight champion, having first won the WBO title in 2000 after an upset corner stoppage over then-undefeated Vitali Klitschko. In his first title defense later that year, he lost to Vitali's brother Wladimir Klitschko. In 2002, Byrd defeated Evander Holyfield to win the IBF heavyweight title for his second reign as world champion. He made four successful defenses until losing his title again to Wladimir Klitschko in a 2006 rematch. Byrd's cousin, Lamon Brewster, has a shared history with Wladimir Klitschko: Brewster defeated him in 2004, but lost in a 2007 rematch. Context_8 : Muamer Hukić (born 11 November 1984), best known as Marco Huck, is a German professional boxer known for his aggressive style and punching power. He is the second longest reigning cruiserweight world champion of all time, having held the WBO title from 2009 to 2015, making thirteen consecutive successful defenses, which is a division record shared with Johnny Nelson. Huck also held the IBO cruiserweight title from 2016 to 2017, the European cruiserweight title from 2008 to 2009, and has challenged once for the WBA (Regular) heavyweight title in 2012. Context_9 : Edwin Valero (December 3, 1981 – April 19, 2010) was a Venezuelan professional boxer who competed from 2002 to 2010. He was an undefeated two-weight world champion at the time of his death, 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 style and exceptional punching power, Valero remains the only champion in the 30-year history of the WBC to have won every fight in his career by knockout. In 2010, Valero committed suicide in jail after being arrested on suspicion of killing his wife. Context_10 : Iván Calderón Marrero (born January 7, 1975) is a Puerto Rican former professional boxer who competed from 2001 to 2012. He is a two-weight world champion, having held the WBO mini flyweight title from 2003 to 2007 (making eleven successful defenses and being recognized as super champion by the organization), and the WBO, " Ring" magazine, and lineal light flyweight titles from 2007 to 2010 (making six successful defenses). Additionally, his August 2010 bout against Giovani Segura was named fight of the year by " Ring" magazine. As an amateur Calderón represented Puerto Rico in international competitions, including the 2000 Olympics. fact_1 :  He is the second longest reigning cruiserweight world champion of all time, having held the WBO title from 2009 to 2015, making thirteen consecutive successful defenses, which is a division record shared with Johnny Nelson. fact_2 : Ivanson Ranny "Johnny" Nelson (born 4 January 1967) is a British former professional boxer who competed from 1986 to 2005. Answer: Johnny Nelson
Output: Muamer Hukić, best known as Marco Huck, is a German professional boxer known for his aggressive style and punching power, he is the second longest reigning cruiserweight world champion of all time, having held the WBO title from 2009 to 2015, making thirteen consecutive successful defenses, which is a division record shared with which British former professional boxer who competed from 1986 to 2005?