My vote goes to Osamu Watanabe of Japan. 169-0 in international competition. Never taken down in any of those matches.

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What other good candidates are out there? (any weight)

movahed was unstoppable for years in the 60's technically he was the perfect wrestler.

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I want to know where Wantanabe got all those wins. If I remember correctly he is a 1x Olympic champ, 2x world champ. What other tournaments did he win
to get to 169 victories?

A couple of more recent studs: Adam Saitiev isn't one of the greatest of all time, but winning 2x world titles and multiple Russian, European and Yarygin titles essentially wrestling up a weight is pretty friggin' tough. Gatsalov has got to be one of the mentally toughest; he isn't head and shoulders above his competition in technique or physical talent but he is unreal at winning close matches consistently.