With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Wladimir Klitschko has fought in more heavyweight title fights than any heavyweight champion in the sport's history.
text_B: Wladimir Wladimirowitsch Klitschko -LRB- Володимир Володимирович Кличко , ; born 25 March 1976 -RRB- is a Ukrainian professional boxer .. professional boxer. professional boxer. He is a former world heavyweight champion of three major sanctioning bodies , having held the titles of the WBA , IBF , and WBO -LRB- twice -RRB- ; additionally he has held the IBO , Ring magazine , and lineal heavyweight titles .. heavyweight. heavyweight. WBA. World Boxing Association. IBF. International Boxing Federation. WBO. World Boxing Organization. IBO. International Boxing Organization. lineal. lineal championship. A strategic and cerebral boxer , Klitschko is considered to be one of the greatest heavyweight champions of all time , as well as among the hardest punching knockout artists in the history of the division ; his strong jab , straight right hand and left hook being his most formidable weapons .. heavyweight. heavyweight. knockout. knockout. jab. jab. straight right hand. cross ( boxing ). left hook. hook ( boxing ). As an amateur , Klitschko represented Ukraine at the 1996 Olympics , winning a gold medal in the super-heavyweight division .. heavyweight. heavyweight. amateur. amateur boxing. 1996 Olympics. 1996 Olympics. super-heavyweight. super-heavyweight. After turning professional later that year , he defeated Chris Byrd in 2000 to win the WBO heavyweight title .. heavyweight. heavyweight. WBO. World Boxing Organization. Chris Byrd. Chris Byrd. Klitschko 's first reign as champion ended in an upset knockout loss to Corrie Sanders in 2003 , which was followed by another knockout loss to Lamon Brewster in 2004 .. knockout. knockout. Corrie Sanders. Corrie Sanders. Lamon Brewster. Lamon Brewster. It was during this time that Klitschko hired Emanuel Steward as his trainer , which began an eight-year partnership that lasted until Steward 's death in 2012 .. Emanuel Steward. Emanuel Steward. In particular , Steward was credited with Klitschko 's transition from an aggressive puncher to a more defensively-oriented boxer , much as he had done with Lennox Lewis in 1995 to 2003 .. Lennox Lewis. Lennox Lewis. In 2006 , Klitschko regained a portion of the world heavyweight championship after stopping Chris Byrd in a rematch to win the IBF and IBO titles .. heavyweight. heavyweight. IBF. International Boxing Federation. IBO. International Boxing Organization. Chris Byrd. Chris Byrd. stopping. technical knockout. He won the WBO title for a second time by defeating then-unbeaten champion Sultan Ibragimov in 2008 .. WBO. World Boxing Organization. Sultan Ibragimov. Sultan Ibragimov. Following his defeat of Ruslan Chagaev in 2009 , Klitschko was awarded the Ring and lineal titles , and lastly he won the WBA title from David Haye in 2011 .. WBA. World Boxing Association. lineal. lineal championship. Ruslan Chagaev. Ruslan Chagaev. David Haye. David Haye. Until his defeat by Tyson Fury in 2015 , Klitschko was also recognized as champion by the Transnational Boxing Rankings Board , while the WBA recognized him as one of its `` Super champions '' , a distinction given to boxers who hold that title in addition to those by other sanctioning bodies in the same division .. WBA. World Boxing Association. Tyson Fury. Tyson Fury. Transnational Boxing Rankings Board. Transnational Boxing Rankings Board. Super champions. WBA ( Super ). Overall , he became the second-longest reigning heavyweight champion of all time , and has the second-most successful title defenses total of any heavyweight boxer with 23 -LRB- including his initial reign as WBO champion -RRB- , behind Joe Louis -LRB- 25 -RRB- and ahead of Larry Holmes -LRB- 20 -RRB- and Muhammad Ali -LRB- 19 -RRB- .. heavyweight. heavyweight. WBO. World Boxing Organization. second-longest reigning heavyweight champion of all time. longest reigning heavyweight champions. Joe Louis. Joe Louis. Larry Holmes. Larry Holmes. Muhammad Ali. Muhammad Ali. On 14 September 2015 , BoxRec rated Klitschko as the number one fighter in the world , pound for pound .. BoxRec. BoxRec. pound for pound. pound for pound. On 15 November 2014 , he reached a career peak of number two on The Rings pound for pound list .. pound for pound. pound for pound. Klitschko has fought in 29 heavyweight title fights , more than any heavyweight champion in the sport 's history .. heavyweight. heavyweight. He also holds the record of having defeated the most boxers with an undefeated record , at 12 , and has also defeated ten current or former world champions throughout his career .. Wladimir 's older brother , Vitali Klitschko , is also a former WBC , WBO , and The Ring heavyweight champion .. heavyweight. heavyweight. WBO. World Boxing Organization. Vitali Klitschko. Vitali Klitschko. From 2006 until 2015 , Wladimir and Vitali dominated heavyweight boxing , a period typically known as the `` Klitschko Era '' of the division .. heavyweight. heavyweight. Klitschko Era. Klitschko brothers
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