Are we going by percentage of total fights that end in a KO win, or just victories ending in a KO win?
Frank Bruno has one up in the latter, with 38 of his 40 wins by stoppage, with Vitali having 37 of 39 wins by stoppage. But Bruno had 5 losses compared to 2 for Vitali, so his KO% using total fights as a denominator is lower.
And that's only including champs/title-holders. Some non-champs had higher KO percentages, like Lamar Clark. He was 44-3 with 43 KOs. Mac Foster was 30-6, with all of his wins coming via stoppage.
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