Fights against Alexander Povetkin, Joseph Parker and Wladimir Klitschko have come with a huge purse.
Anthony Joshua is thought to have earned more than £50 million already from his boxing career.
The World Heavyweight Champion is thought to have a purse of about £8 million for his latest fight against Alexander Povetkin – but that is low compared to others of late.
AJ was thought to have pocketed £13 million of the £20 million proceeds from the fight with Joseph Parker before.
They have taken his career earnings in boxing past a reported £50 million – with a lot more expected to follow.
In fact, it is thought that on the back of successes against the likes of Dillian Whyte and Wladimir Klitschko and more to come, Joshua could be the richest sportsman on earth.
A major factor for that could be a fight with Deontay Wilder, which has been liked to a $50 million purse.
Former heavyweight world title challenge Scott Welch has no doubts that Joshua is now on the way to becoming the world’s richest sportsman.
Welch, speaking in the Daily Telegraph, said: “I believe that Anthony Joshua will be the first billionaire fighter. I really do believe that.
“Floyd Mayweather has earned £500 or £600million, Mike Tyson earned £300-odd million 20 or 30 years ago. This guy, as a heavyweight, has got the potential to be the first billionaire fighter.
Joshua, now 28, had his first run-in with the police at age 16. At that time, he was a promising footballer and athlete who could run 100 metres in less than 11 seconds.
But a clash during a school football match saw him charged with actual bodily harm.
He recalled: “This guy was trying to wind me up. I got him round the neck and threw him over my shoulder.
“I didn’t know my own strength and he didn’t land too well. It went to court. Luckily, they gave me a slap across the wrist.”
Joshua may have escaped jail that time, but he was still heading for trouble.
He was handed a 12-month suspended sentence and 100 hours of community service. Joshua said: “In a way I’m glad it happened, because it woke me up.
“It wasn’t so much the actual charge that had the effect. It was all the grief from my friends, my family – especially my mum – and from boxing. “
Joshua was initially banned by GB boxing, but was recalled for the European Championships, where he reached the quarter finals, despite being short on practice.
He was then selected for the World Amateur Championships in Azerbaijan. His mum, who had never been to one of his fights, stayed at home and watched on television.
Yeta said: “It was very nerve-racking. I kept covering my eyes with a towel. I was caught between wanting to watch and not wanting to see him get hurt. I was trembling.”
A year later, Joshua won gold at London 2012. It was the first time his mum saw him fight in the flesh.
She said: “For Josh to become an Olympic champion is an incredible achievement.
“He has always been able to dedicate himself to whatever he wanted. I am very proud of what he has achieved.”
After his Olympic triumph, he shunned the spotlight in favour of a more humble life. He turned down £50,000 to turn professional straight away, preferring to bide his time.
When at training camp, he lives off packed lunches of chicken, beef, pasta and boiled eggs in plastic boxes.
Joshua’s promoter, Eddie Hearn, says: “Avoiding prison was a big turning point for Anthony. He’s a bad guy trying to be good.
“Boxing has saved his life. It’s given him discipline, a focus for that huge physique.”