Tommy Morrison stopped Donovan “Razor” Ruddock with 5 seconds remaining in the sixth round in Kansas City, Mo., to capture the International Boxing Council’s vacant heavyweight title and resurrect his flagging career.

Morrison (45-2-1) appeared tired in the fourth round, but came back and knocked down Ruddock with a powerful left hook early in the sixth before finishing him off with a right-left combination. Ruddock, fighting just his second bout in two years, did not go down, but the fight was stopped.

On the same card, Roberto Duran knocked out Roni Martinez with a flurry of punches in the seventh round night to win the IBC super middleweight title.