Britain’s Tyson Fury, left, and Ukraine’s Oleksandr Usyk face off during the weigh-in on Friday prior to their undisputed heavyweight championship fight on Saturday. Francisco Seco/Associated Press

After Tyson Fury and Oleksandr Usyk finally meet in the ring this weekend, boxing should have its first undisputed heavyweight champion in nearly a quarter-century.

These are the two best fighters from a strong era of heavyweight boxing. Both have reached their mid-30s still undefeated, and both are determined to reach the pinnacle of their careers by winning every major title belt in their division – a feat that hasn’t been accomplished since Lennox Lewis did it in 1999.

“Not only will we be crowning the undisputed heavyweight champion, but the two participants in the fight have never, ever lost a fight,” promoter Bob Arum said. “Now, how rare is that?”

Usyk (21-0, 14 KOs) has held three of the world’s major titles for nearly three years, while Fury (34-0-1, 24 KOs) holds the fourth after a career in which he has worn all four championship belts at different points.

They’ve circled a winner-take-all meeting for years – and after false starts, detours and delays, they’re finally together for a fight that will happen deep into Sunday morning in Saudi Arabia to reach a Western audience on Saturday.

“I’m ready for a good fight,” Fury said. “And if it’s tough or easy, either way, I’ll be ready.”

The last heavyweight to hold all four major belts was Lewis, who beat Evander Holyfield in 1999 by unanimous decision in Las Vegas. His undisputed reign only lasted about six months, thanks to one of the infinite turf disputes seemingly created whenever sanctioning bodies are involved.

The current monumental moment in boxing history is happening at Riyadh’s Kingdom Arena, and that’s no coincidence: Oil-rich Saudi Arabia is spending lavish amounts of money to make the world’s top fights, steamrolling the typical grudges and turf disputes between elite boxers and their territorial promoters.

These fighters’ camps have been at odds for years – Fury’s father head-butted a member of Usyk’s entourage on Monday, leaving John Fury with blood streaming down his face – but money made their grudges go away. Fury reportedly could make $100 million or more in this bout, and a lucrative rematch is highly likely in the fall.

This fight was delayed twice after Fury said he needed more time following his embarrassing performance against former UFC heavyweight champion Francis Ngannou. Fury barely got a split decision to beat a mixed martial artist competing in his first professional boxing match, and the effort stoked speculation as to whether Fury is finally headed downhill.

The 6-foot-9 Fury has never possessed a classic prizefighter’s physique, but he looked excessively pudgy when he fought Ngannou, and most observers related his poor conditioning to his overall lack of preparation for the bout.

But Fury showed up in Saudi Arabia to meet Usyk looking noticeably slimmer, and now some are wondering whether he overdid it – whether he will have the bulk to withstand Usyk’s body work while retaining the strength to respond with his own power shots.

Fury simply laughs at the speculation, trusting his own training and strength to power through any challenge, no matter the measure of his waistline.

“(Forget) his belts,” Fury said. “I’m coming for his heart. That’s what I’m coming for.”

This is a fascinating tactical fight: The 6-foot-3 Usyk is smaller than Fury, but the Ukrainian’s work rate and high-level skill have proven insurmountable for nearly all of his opponents. Usyk seems likely to pressure Fury in an attempt to get inside the Briton’s superior wingspan, while Fury is likely to pull out every trick and stratagem in his enormous stockpile to keep Usyk off balance and frustrated.

Both fighters have knockout power, yet both are obviously durable. Fury is motivated to atone for his last performance, while Usyk has a chance to complete his stunning rise from cruiserweight stardom to heavyweight supremacy.

“I’m excited,” Usyk said. “Let’s make history!”