Undisputed world heavyweight champion

claimed the 50th knock-out and 60th victory of his career on

Saturday when he ended hapless Frenchman Jean-Marc Mormeck’s hopes in the

fourth round.

Klitschko, 35, defended his IBF, IBO, WBO and WBA titles against Mormeck,

who stepped up from cruiserweight just over two years ago, in Dusseldorf and

made good on his promise to knock the Frenchman out.

Mormeck, who turns 40 in June, was lucky to finish the second round after

Klitschko put him on the canvas with 80 seconds left in the round with a firm

right to the chin and then pinned him in a corner with a rapid combination.

The challenger was offering only token resistance and made a mockery of his

pre-fight promises to smash Klitschko’s “glass jaw” which was as ineffective as

the handful of punches he threw in the opening rounds.

The pair both ended on the canvas in the third after a slip, but it was all

over in the fourth when a swift combination from the champion saw the Frenchman

drop his guard and a final head shot left Mormeck on the canvas.

Puerto Rico referee Luis Pabon stepped in quickly to count out the fight at

one minute and 12 seconds as the Frenchman lost his fourth fight in the

heavyweight division.

The pair were scheduled to meet last December, but kidney stones forced

Klitschko to postpone the original fight and the ease of the champion’s win

will have done little answer the critics who said he had picked an easy fight.