LONDON (AP)Tyson Fury wants a fourth straight knockout on his unbeaten record when he meets his old punching bag Derek Chisora in a WBC heavyweight title fight at Tottenham Hotspur Stadium on Saturday.

Fury has already beaten Chisora twice. He gave his fellow Briton his first loss in 2011 by unanimous decision, and Chisora was retired by his corner in 2014 after the 10th round.

Despite 12 losses in 45 fights, Chisora has been given a second world title shot by a charitable Fury wanting to keep busy.

Fury announced his retirement after stopping Dillian Whyte in the sixth round in April, then changed his mind. Attempts to match up with unbeaten Oleksandr Usyk and Anthony Joshua failed.

The champion said he’s focused with trainer SugarHill Steward on boxing smarter as he gets older. He’s 34.

”Everything has been slowed down to do maximum damage and that’s what we’re going for every time,” Fury said. ”This will be my fourth fight in a row where we are looking for a knockout.”

Fury has an 18 centimeter height advantage on Chisora, a reach advantage of more than 28 centimeters, and will be three kilograms heavier.

Fury weighed in at 122 kilograms, about seven kilos more than he was against Whyte, and Chisora was 119, his heaviest in five years.

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