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However, the 31-year-old won't be matching the £66 million payday from the Ruiz bout that was reported by Talksport.
According to the Daily Telegraph, this time round Joshua will be taking home around £10 million - which still isn't a bad wage.
This means that Joshua will be earning a whopping £56 million less than he did when he reclaimed the WBA, WBO, and IBF world heavyweight titles from Ruiz last year.
Anthony Joshua reflects on his lone loss to Andy Ruiz.- DAZN Boxing (@DAZNBoxing) December 8, 2020
"He's changed me for the better. ... I definitely still possess that killer instinct and gladiator mindset." :boom: pic.twitter.com/Ck6vP3NBFS
This may be slightly disappointing to the two-time world heavyweight champion, haing told GQ, "I need to be a billionaire," a few years back.
However, before he starts worrying about his earnings, Joshua will have to concentrate on defeating Pulev.
The Bulgarian holds a similar record to the Brit, with 28 victorys and one defeat - against Wladimir Klitschko. To compare, Joshua has 23 victories and one defeat - conquering Klitschko but falling in a shock loss to Ruiz in 2019.
Joshua spoke ahead of the fight to warn that a year without fighting could leave him rusty: "This year has just thrown every obstacle at us all. I might go in there, I can tell you that I'm a million dollars, I feel good, I've been knocking everyone out in sparring.
"I'm the one that's coming up now and I'm going to be the undisputed champ and I go in there on Saturday night and I [might] get my head punched in because I've got ring rust. Who knows?
Meanwhile, Pulev is confident of the upset: "He's strong. He has power, and that power is very dangerous. But I am
technically better and I think this is very important in this fight. We
see a lot of mistakes from Anthony. A lot of bad sides to him. I think
these mistakes, and the bad sides, have stayed. When I am good, I beat
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