Following wins over Deontay Wilder and Dillian Whyte in the last six months, WBC and Ring Magazine champion Tyson Fury is regarded as the best heavyweight in the world.
Then there is Wilder - the biggest hitting heavyweight since Mike Tyson - followed by two-time champion Joshua.
What do they all have in common you ask? All four are in their 30s.
While heavyweight fighters can go on until they approach 40, the quartet can not carry on forever which begs the question - who are the next generation of heavyweights?
Below, Planet Sport looks at five fighters who can begin a new era of heavyweight boxing.
The American is promoted by Top Rank's Bob Arum and there is hype around the 22-year-old, including praise from Tyson Fury.
The 'Gypsy King' has had Anderson as a sparring partner for his last couple of fights and was originally scheduled to fight on the undercard of Fury-Whyte in April but he was forced to withdraw due to injury.
He has won all 11 of his professional fights inside the distance and is the current Junior NABF titleholder.
The 'Cuban Flash' is coached by Eddy Reynoso and there is great hope that he will become a future world champion.
Undefeated from 21 fights (one being a no contest), Sanchez is progressing nicely with standout wins over fellow prospect Efe Ajagba and Christian Hammer. He also outpointed Joey Dawejko - a fighter who reportedly knocked out Anthony Joshua in sparring.
He is ranked inside the top five by the WBC and WBO rankings as well as Ring Magazine's top 10 heavyweights.
Frank Warren's fighter is set to challenge Trevor Bryan for the WBA regular title this summer in America.
Tipped to be the next big thing in the UK, Dubois' profile took a hit when he got stopped by Joe Joyce in 2020.
However, he has since recorded two wins since and under Shane McGuigan, there have been improvements. He can take a big step in the right direction with victory over Bryan on June 11.
A gold-medallist at the 2016 Olympics - albeit a controversial win over Joe Joyce in the final - Yoka is certainly worth keeping tabs on.
The Frenchman is 11-0 and will face a tough test next against German Agit Kabaye for the EBU strap.
Should he come through, then it will prove he has the credentials to move on to bigger things and if he can fulfil his potential then Yoka could become France's first heavyweight world champion.
The Russian is a heavy hitter and normally when he lands, it's goodnight for his opponent.
The 30-year-old is 14-0 and most recently beat Mariusz Wach - a former world title challenger in 2012. The question will be, how does Makhmudov react when he faces someone who can handle his punches?
Makhmudov is under the tutelage of trainer Marc Ramsey - the same coach who works with light heavyweight king Artur Beterbiev.
The Croat was set to fight on the undercard of Canelo-Bivol but pulled out of an IBF eliminator against Zhang Zhilei.
The 29-year-old has won all 14 pro bouts, winning 12 of them inside the distance and is on the cusp of challenging for world honours within the next two years should he remain undefeated.
Jalolov is a southpaw heavyweight who has good hand speed and can throw a brutal left hand.
The 27-year-old has fought at two Olympic Games (2016 and 2020) - the latter saw him take time out of the professional circuit and he won gold at super heavyweight.
Jalolov is part of an Uzbekistan group of talent which includes Murodjon Akhmdaliev, Israil Madrimov and Bektemir Melikuziev. The four could have a lasting legacy in the sport.
Ajagba represented Nigeria at the 2016 Olympics and turned over under renowned trainer Ronnie Shields.
He instantly became a must-watch fighter with huge knockout power that has seen him compared to Deontay Wilder.
The 27-year-old - who has the fastest win in boxing history at one second due to his opponent leaving the ring after one second - had a set back in losing to Frankie Sanchez last October.