Joshua v Usyk: Ukrainian aiming to follow Klitschko brothers, Povetkin and Valuev
Heavyweights from Eastern Europe and the former Soviet Republics have reigned in the past, but could a new champion be crowned?
Oleksandr Usyk will aim to make the most of his opportunity on Saturday, with the Ukrainian looking to upset the odds and dethrone Anthony Joshua in London.
Already holding the IBF, WBA and WBO titles, heavyweight Joshua appeared set for a hugely lucrative unification showdown with Tyson Fury, holder of the WBC belt, that would identify an undisputed champion in the division.
An arbitration hearing put paid to that plan, though, as Fury was ordered to face Deontay Wilder for a third time, denying boxing fans the fight they desperately wanted to see.
However, Usyk is an intriguing prospect for Joshua to deal with. Dominant at cruiserweight before stepping up, the 34-year-old has the potential to cause problems, considering both his boxing skills and outstanding resume.
Britain may dominate right now, but fighters from Eastern Europe and the former Soviet Republics have ruled the roost at different times, albeit with varying degrees of longevity.
The baton passed from the famed heavyweights of the 1990s to the coming generation when Lennox Lewis uncharacteristically slugged his way to victory over Vitali Klitschko in Los Angeles in June 2003. The last man standing from his era after comprehensively beating Mike Tyson, Lewis was given hell by "Dr Steelhammer" but managed to inflict enough damage for the challenger to be stopped on cuts after six gruelling rounds.
Lewis never boxed again and Klitschko never lost again, winning 13 fights in succession either side of a four-year retirement. He lifted the WBC title and settled a family grudge by stopping Corrie Sanders in April 2004. He was never without the famous green belt in the ring up until he hung up his gloves in 2012 to focus full-time on a political career than now sees Vitali serving at the Mayor of Kyiv.
The younger Klitschko was the first eastern European to lift a heavyweight title in the 21st century when he twice floored Chris Byrd on the way to a unanimous decision to win the WBO belt in October 2000. Byrd became champion in his previous fight when, way down on the cards, Vitali withdrew on his stool due to a shoulder injury. It meant Vitali was returning a favour against Sanders, who demolished Wladimir over two harrowing rounds in March 2003.
Another knockout loss followed a little over a year with the vacant WBO strap on the line against Lamon Brewster. At that stage, it was impossible to foresee the imperious dominance that would follow a second win over Byrd for the IBF and 18 successful defences. Closing out his career with losses to Fury and Joshua carried a heavy sense changing eras, as with his brother and Lewis a decade and a half earlier.
All the men on this list could lay claim to the moniker of "Beast from the East" but none would be able to pull it off as well as the preposterously proportioned Valuev. Standing at 7ft and tipping the scales at over 300lbs, he became the tallest and heaviest heavyweight champion in history. Valuev's skills were akin to a rudimentary club fighter, but he was just far too big for most opponents to handle.
Each of his two stints as WBA ruler began with prophetically forgettable points wins over John Ruiz and after a 2008 loss to a pot-shotting David Haye he walked away to a varied post-fight career. Like Klitschko he entered politics, winning election to the State Duma in Russia's 2011 parliamentary election. He also became an unlikely face of children's television in his homeland, presenting the long-running "Good Night, Little Ones!".
Liakhovich's period reign as WBO champion lasted seven months. The Belarusian won a unanimous decision win over Brewster in April 2006, despite taking a knee in the seventh. He was up on the cards when Shannon Briggs dramatically knocked him through the ropes during the closing seconds of his first defence. Briggs was the last American to get his hands on any portion of the heavyweight title before Wilder's WBC reign began in 2015. Two years earlier, the "Bronze Bomber" left Liakhovich quivering on the canvas after a terrifying first-round KO.
Three months before Briggs' late show against Liakhovich, Maskaev battered one-time Lewis conqueror Hasim Rahman to defeat inside the final minute of their August 2006 rematch in Las Vegas. A product of the Soviet amateur system, Maskaev based himself in the US for the majority of his professional career. He was 37 by the time he ripped the WBC crown from Rahman and, after a successful defence against Okello Peter in Moscow, the Kazakh-born fighter was knocked out by Samuel Peter - the "Nigerian Nightmare" who was himself stopped by a returning Vitali Klitschko next time out.
If the WBA was a sofa, Chagaev would be the loose change they continue to find lurking between the cushions. He first won the organisation's belt with a majority decision win over Valuev in April 2007, although subsequent illness and injury led to him being declared "champion in recess". As such, the WBA belt was not on the line when his corner waved off a June 2009 shellacking at the hands of Wladimir Klitschko after nine rounds.
The organisation then elected to install Chagaev not as its champion but number one challenger, and he dropped an August 2011 decision to Alexander Povetkin for the vacant belt. The story did not end there, however, as Chagaev and the unheralded Fres Oquendo were selected to box for the WBA's vacant "regular" title in July 2014. Almost two years and one competitive round later, Chagaev was knocked out by Lucas Browne, who then failed a drugs test. The Uzbek was given back his title, only to be stripped in July 2016 for failing to pay the WBA sanctioning fees for that already barely remembered Oquendo contest, seemingly ending the saga.
Not one to linger like Chagaev, Russia's Sydney 2000 heavyweight silver medallist Ibragimov outpointed Briggs in his 22nd professional bout to lift the WBO belt in June 2007. Under the tutelage of Jeff Mayweather, he comfortably beat the great Evander Holyfield in his first defence. A unification showdown with Wladimir Klitschko was most notable for the Madison Square Garden crowd booing a safety-first affair. With that sole defeat, Ibragimov was gone, retiring in 2009 due to persistent injuries to his left hand.
Another decorated amateur, Povetkin won super-heavyweight gold at the 2004 Olympics and made four defences of the WBA title after beating Chagaev. To repeat a theme, all roads led to an uncompromising Klitschko, with Wladimir sending him to the canvas four times during a landslide Moscow triumph in October 2013. Failed drugs tests did little for Povetkin's wider reputation and put paid to a proposed meeting with Wilder.
A promising start unravelled to a seventh-round stoppage when challenging Joshua in September 2018, although Povetkin sensationally recovered from two knockdowns to ice Dillian Whyte this year. After losing the rematch, the Russian announced his retirement at the age of 41.