LONDON, England — It's a scorching day and Don Charles, a few weeks out from his fighter Daniel Dubois' world heavyweight championship rematch with Oleksandr Usyk, strolls into his gym, acknowledges those who are already present and extends a bone-crushing handshake.

Charles' gym sits on a plot of farmland in Borehamwood, technically on the outskirts of the capital. Horses roam the surrounding fields but inside the four walls of his pugilistic sanctum lies the blueprint, he hopes, to beating the undefeated, enigmatic Usyk.

The pair have already tried and failed once, 23 months ago. It was controversial but definitive at the same time. Since then, it's been sunshine, rainbows, blood and thunder from Don and Dan.

The fight, which will take place in front of 90,000 baying British fans at Wembley Stadium, is the biggest and most important of both men's careers. It will be streamed live on DAZN PPV.

For Charles, he likely wouldn't be here, were it not for a chance encounter at Temple Fortune petrol station over 20 years ago.

He tells The Ring: "Ten days after I got the keys for my first studio ... I hadn't built it yet, one of my friends wanted a lift to Notting Hill Gate. On the way, I needed to get petrol before I joined the North Circular. I drove into a petrol station between Golders Green and Finchley.

"I met a young man who my friend started talking to, he was 19 years old, he was an amateur fighter at the time and he'd only had six fights ... Derek Chisora. We essentially gave birth to each other.

"I developed him. He gave life to me and developed me as a coach, it's a mad story. When I think about it ... had I not offered to give my friend a lift that day, I wouldn't have bumped into him. I had petrol, but I don't like driving with a low tank. 'Let me just top up' I said. Had I not ... [pauses] it's just timing.

"That's why I'm a strong God-fearing man. I'm a strong believer in God and the universe. It's almost like God repays you for your kindness, it was a small act of kindness. I still drive past it all the time.

"You know what I haven't done? I've got to do it soon — To go and literally stand there and record myself talking, because there's a documentary pending and a book pending. 50 fights later and the crazy one Derek is still very relevant, I've trained him for like 36 of them. He's my boy."

This weekend will be glitz and glam, face-offs, trash-talk, extravagant walkouts and the ultimate heavyweight prize will be on the line. But there is overwhelming evidence that Charles, who left Biafra for the UK aged 14 following the Nigerian civil war, wants a simpler life. One which closely resembles what goes on just outside his gym, not what goes on in it.

He has "always worked". He ran a security company in London's West End for several years. He sold clothes for a manufacturing company before opening a flower shop with his then-girlfriend at the turn of the millennium. Then came time to open his gym in 2004 and attention was turned back to boxing, which he first got into at the age of 19, five years after he settled on British shores.

"I'm an African man, we're natural traders," he says with a smile.

"Everything I've ever done, I've always made it successful."

Charles will make a hefty seven-figure payday from Dubois' clash with Usyk, win or lose. It's put to him that future business ideas will prosper like never before, but he shoots that notion down.

"I was able to do things with no money years ago," he adds. I was able to produce with no money. I have the ability to make something out of very little. The more money I get, the more people I can help.

"I also want to build a farm, my own farm. It's not necessarily to make money. It's just to live organically and get back to nature. When I was growing up in Africa, that's how it was, everybody had an allotment. We lived off the land, grew and harvested our own crops."

For now, that dream is in the distance. He's a job to do on Saturday night and it's perhaps the most important job in all of boxing today. Nothing touches the heavyweight championship of the world and with The Ring, WBC, WBA, IBF & WBO titles on the line, history beckons.

Dubois is still an unassuming, shy character who only benefits from larger than life characters like Charles, his dad Stan and promoter Frank Warren in and around his circle.

Charles and Dubois only had 14 weeks to work together when they first came up against Usyk, Now, things are different, and both men believe the wrongs from that night in Wroclaw, Poland, will be righted on home turf.

"Daniel was denied victory," Charles says, in reference to Low blow-gate. As human beings, when it doesn't go our way, you question God. Why?

"But God says 'right, I'm going to show it to you. I'm going to take it away, go away, regroup, work harder and then I'll repackage it in a bigger package and I'm going to present it to you.

"I really, truly believe what I'm saying to you. Everything's for a reason. We've gone our way, worked harder, got to know each other better. Look at the results Daniel's had in the last 20 months, the personnel he's beaten.

"And who do we find again at the final hurdle? It's Oleksandr Usyk. It's our turn now. The package and prize is bigger. Truly, as I sit here, I truly believe Daniel will beat him and we will be successful on July 19 at Wembley."

A lot has been made about what Dubois needs to do differently in order to unseat Usyk as the heavyweight division's king. After all, his elder statesman compatriots Anthony Joshua and Tyson Fury both failed in their sequels with the Ukrainian.

Charles knows that although a lot of the talk has centred on the body shot-low blow, changes need to be made. Whether those changes reap the right rewards will be down to the universe and its leader.

"I don't pray every night," he says. "I pray every second because I carry my Bible in my heart. What you put out to the universe, that's a form of meditation. If it's written, and we believe it's written by God, it's destined. We're talking about destiny here.

"Yeah, we come in peace, but seek and destroy. God and the universe will take care of the rest."