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World heavyweight boxing champions Vladimir Klitschko of Ukraine celebrates with an Ukrainian flag after defeating Australian challenger Alex Leapai during their WBO heavyweight title fight in Oberhausen April 26, 2014. Klitschko won
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![Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) lands a punch during his title fight against challenger Bulgarian heavyweight boxer Kubrat Pulev in Hamburg, November 15, 2014. Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) lands a punch during his title fight against challenger Bulgarian heavyweight boxer Kubrat Pulev in Hamburg, November 15, 2014.](https://c8.alamy.com/comp/2CWJ65N/ukrainian-wba-wbo-ibo-and-ibf-heavyweight-boxing-world-champion-vladimir-klitschko-r-lands-a-punch-during-his-title-fight-against-challenger-bulgarian-heavyweight-boxer-kubrat-pulev-in-hamburg-november-15-2014-world-heavyweight-champion-vladimir-klitschko-knocked-out-bulgarian-challenger-kubrat-pulev-with-a-fierce-left-hook-in-the-fifth-round-on-saturday-to-retain-his-ibf-title-and-end-his-opponents-unbeaten-record-reutersfabian-bimmer-germany-tags-sport-boxing-2CWJ65N.jpg)
Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) lands a punch during his title fight against challenger Bulgarian heavyweight boxer Kubrat Pulev in Hamburg, November 15, 2014.
![Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) lands a punch during his title fight against challenger Bulgarian heavyweight boxer Kubrat Pulev in Hamburg, November 15, 2014. Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) lands a punch during his title fight against challenger Bulgarian heavyweight boxer Kubrat Pulev in Hamburg, November 15, 2014.](https://c8.alamy.com/comp/2CY00R0/ukrainian-wba-wbo-ibo-and-ibf-heavyweight-boxing-world-champion-vladimir-klitschko-r-lands-a-punch-during-his-title-fight-against-challenger-bulgarian-heavyweight-boxer-kubrat-pulev-in-hamburg-november-15-2014-world-heavyweight-champion-vladimir-klitschko-knocked-out-bulgarian-challenger-kubrat-pulev-with-a-fierce-left-hook-in-the-fifth-round-on-saturday-to-retain-his-ibf-title-and-end-his-opponents-unbeaten-record-reutersfabian-bimmer-germany-tags-sport-boxing-2CY00R0.jpg)
Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) lands a punch during his title fight against challenger Bulgarian heavyweight boxer Kubrat Pulev in Hamburg, November 15, 2014.
![Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (L) and challenger Bulgarian heavyweight boxer Kubrat Pulev exchange punches during their title fight in Hamburg, November 15, 2014. World Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (L) and challenger Bulgarian heavyweight boxer Kubrat Pulev exchange punches during their title fight in Hamburg, November 15, 2014. World](https://c8.alamy.com/comp/2D0CJ4X/ukrainian-wba-wbo-ibo-and-ibf-heavyweight-boxing-world-champion-vladimir-klitschko-l-and-challenger-bulgarian-heavyweight-boxer-kubrat-pulev-exchange-punches-during-their-title-fight-in-hamburg-november-15-2014-world-heavyweight-champion-vladimir-klitschko-knocked-out-bulgarian-challenger-kubrat-pulev-with-a-fierce-left-hook-in-the-fifth-round-on-saturday-to-retain-his-ibf-title-and-end-his-opponents-unbeaten-record-reutersfabian-bimmer-germany-tags-sport-boxing-2D0CJ4X.jpg)
Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (L) and challenger Bulgarian heavyweight boxer Kubrat Pulev exchange punches during their title fight in Hamburg, November 15, 2014. World
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![Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) delivers a punch to his challenger Bulgarian Kubrat Pulev during their title fight in Hamburg, November 15, 2014. REUTERS/Fabian Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) delivers a punch to his challenger Bulgarian Kubrat Pulev during their title fight in Hamburg, November 15, 2014. REUTERS/Fabian](https://c8.alamy.com/comp/2CXNWD9/ukrainian-wba-wbo-ibo-and-ibf-heavyweight-boxing-world-champion-vladimir-klitschko-r-delivers-a-punch-to-his-challenger-bulgarian-kubrat-pulev-during-their-title-fight-in-hamburg-november-15-2014-reutersfabian-bimmer-germany-tags-sport-boxing-2CXNWD9.jpg)
Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko (R) delivers a punch to his challenger Bulgarian Kubrat Pulev during their title fight in Hamburg, November 15, 2014. REUTERS/Fabian
![World heavyweight boxing champion Vladimir Klitschko of Ukraine celebrates after defeating Australian challenger Alex Leapai during their WBO heavyweight title fight in Oberhausen April 26, 2014. Klitschko won after knock out in World heavyweight boxing champion Vladimir Klitschko of Ukraine celebrates after defeating Australian challenger Alex Leapai during their WBO heavyweight title fight in Oberhausen April 26, 2014. Klitschko won after knock out in](https://c8.alamy.com/comp/2CWM6MX/world-heavyweight-boxing-champion-vladimir-klitschko-of-ukraine-celebrates-after-defeating-australian-challenger-alex-leapai-during-their-wbo-heavyweight-title-fight-in-oberhausen-april-26-2014-klitschko-won-after-knock-out-in-round-six-reuterskai-pfaffenbach-germany-tags-sport-boxing-tpx-images-of-the-day-2CWM6MX.jpg)
World heavyweight boxing champion Vladimir Klitschko of Ukraine celebrates after defeating Australian challenger Alex Leapai during their WBO heavyweight title fight in Oberhausen April 26, 2014. Klitschko won after knock out in
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Ukrainian WBA, WBO, IBO and IBF heavyweight boxing world champion Vladimir Klitschko knocks down his challenger Bulgarian Kubrat Pulev during their title fight in Hamburg, November 15, 2014. REUTERS/Fabian Bimmer (GERMANY -
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