Former world boxing heavyweight champion Wladimir Klitschko stands at a residential district that was damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Marko Djurica 

Former world boxing heavyweight champion Wladimir Klitschko stands at a residential district that was damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Marko Djurica 

Kyiv mayor and former heavyweight boxing champion Vitali Klitschko and his brother Wladimir attend a briefing at a city's humanitarian aid coordination centre, as Russia's attack on Ukraine continues, in Kyiv, Ukraine March 11, 2022. REUTERS/Valentyn Ogirenko 

Former F1 driver Nico Rosberg, tennis legend Boris Becker and boxer Wladimir Klitschko enter the stage during the charity gala "Ein Herz fuer Kinder" (a heart for children) in Berlin, Germany, Saturday, December 7, 2019. Picture taken December 7, 2019. Jens Meyer/Pool via REUTERS 

Former F1 driver Nico Rosberg, tennis legend Boris Becker and boxer Wladimir Klitschko enter the stage during the charity gala "Ein Herz fuer Kinder" (a heart for children) in Berlin, Germany, Saturday, December 7, 2019. Picture taken December 7, 2019. Jens Meyer/Pool via REUTERS 

Former F1 driver Nico Rosberg, tennis legend Boris Becker and boxer Wladimir Klitschko enter the stage during the charity gala "Ein Herz fuer Kinder" (a heart for children) in Berlin, Germany, Saturday, December 7, 2019. Picture taken December 7, 2019. Jens Meyer/Pool via REUTERS 

Former F1 driver Nico Rosberg, tennis legend Boris Becker and boxer Wladimir Klitschko enter the stage during the charity gala "Ein Herz fuer Kinder" (a heart for children) in Berlin, Germany, Saturday, December 7, 2019. Picture taken December 7, 2019. Jens Meyer/Pool via REUTERS 

Gitte Pedersen of Denmark, authorized by the Voluntary Anti-Doping Association (VADA), shows equipment which will be used for drug tests of Ukraine's presidential candidates next to former Boxing World champion Wladimir Klitschko at the Olimpiyskiy football stadium in Kiev, Ukraine April 10, 2019. REUTERS/Valentyn Ogirenko 

Gitte Pedersen of Denmark, authorized by the Voluntary Anti-Doping Association (VADA), shows equipment which will be used for drug tests of Ukraine's presidential candidates next to former Boxing World champion Wladimir Klitschko at the Olimpiyskiy football stadium in Kiev, Ukraine April 10, 2019. REUTERS/Valentyn Ogirenko 

Boxers Anthony Joshua and Wladimir Klitschko in action during their bout for the IBF, IBO and WBA Super World Heavyweight Titles at Wembley Stadium, London, England, April 29, 2017. Action Images via Reuters/Andrew Couldridge/File Photo SEARCH "POY SPORT" FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2017 PACKAGES. TPX IMAGES OF THE DAY 

Former Boxing World champion Wladimir Klitschko receives the Bambi trophy from Joachim Loew during the Bambi 2017 Awards ceremony in Berlin, Germany November 16, 2017. REUTERS/Axel Schmidt 

Former Boxing World champion Wladimir Klitschko receives the Bambi trophy from Joachim Loew during the Bambi 2017 Awards ceremony in Berlin, Germany November 16, 2017. REUTERS/Axel Schmidt 

Golf - European Tour - Alfred Dunhill Links Championship - St Andrews, Britain - October 5, 2017 Ukraine's Wladimir Klitschko during the first round Action Images via Reuters/Craig Brough 

Golf - European Tour - Alfred Dunhill Links Championship - St Andrews, Britain - October 5, 2017 Wladimir Klitschko during the first round Action Images via Reuters/Craig Brough 

Golf - European Tour - Alfred Dunhill Links Championship - St Andrews, Britain - October 5, 2017 Wladimir Klitschko during the first round Action Images via Reuters/Craig Brough 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko and Vitali Klitschko look dejected after the fight Action Images via Reuters / Andrew Couldridge EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Michael Buffer introduces the fighters Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua takes a selfie video after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua poses for a photograph with his team after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua with Watford's Troy Deeney after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua with Wladimir Klitschko after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua with Wladimir Klitschko after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua with former football player Rio Ferdinand after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua with former football player Rio Ferdinand after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua poses for a photograph with friends and family after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua poses for a photograph with friends and family after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua makes his entrance before the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua makes his entrance before the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko makes his entrance before the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua makes his entrance before the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko makes his entrance before the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko knocks down Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua knocks down Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko knocks down Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko knocks down Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua makes his entrance before the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua knocks down Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko and Vitali Klitschko after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua celebrates after winning the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua celebrates after winning the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua celebrates after winning the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua celebrates with Mayor of London Sadiq Khan after winning the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua celebrates with Mayor of London Sadiq Khan after winning the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua celebrates with Mayor of London Sadiq Khan after winning the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko and Vitali Klitschko after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua takes a selfie with Wladimir Klitschko, promoter Kalle Sauerland and Mayor of London Sadiq Khan after the fight Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko is stopped by the referee as Anthony Joshua wins the fight Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Anthony Joshua in action with Wladimir Klitschko Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko is knocked down by Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko receives a count by the referee after being knocked down by Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko is knocked down by Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko receives a count by the referee after being knocked down by Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua v Wladimir Klitschko IBF, IBO & WBA Super World Heavyweight Title's - Wembley Stadium, London, England - 29/4/17 Wladimir Klitschko is knocked down by Anthony Joshua Action Images via Reuters / Peter Cziborra Livepic EDITORIAL USE ONLY.