And the man who recently won the undisputed heavyweight championship of the world is calling him out.

But there are no guarantees that Lewis will have the undisputed heavyweight championship by the time Tyson is ready to fight him.

The undisputed championship is an extremely rare and prestigious accomplishment.

Controversial decision loss to Joe Brown for undisputed lightweight championship of the world.

They'll be assured of an undisputed championship, and they'll deserve it.

The Lewis camp must learn to box a little more cleverly outside the ring or forfeit any hope of the undisputed championship.

It would have been the Trojans' first undisputed national championship since 1972.

The original purpose was to sponsor an undisputed national amateur championship, which was first held in 1895.

Not many people get to fight for a third time for the undisputed championship of the world.

That did not happen, and Oklahoma won the undisputed national championship.