Wladimir Klitschko’s brother says the heavyweight champion is now unbeatable and improving with age.

"I don't see anyone in the world who can beat him," the 43-year-old Vitali Klitschko said after Wladimir’s victory over Kubrat Pulev on Saturday night. "Age is just making him stronger."

Vitali, a three-time former heavyweight champion, was in his younger brother's corner in Hamburg when a sharp left hook from the IBF, WBO, IBO and WBA champion knocked Pulev down for the fourth time to end the bout two minutes and 11 seconds into the fifth round.

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Vitali, now mayor of Kiev in the Ukraine, said his 38-year-old sibling had no peers in the division.

BoxingScene.com reported earlier that Wladimir's return is targeted for a date in April in either the Barclays Center in Brooklyn, Madison Square Garden in New York City or Olympiahalle in Munich.