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.