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.