From the Big Cartoon Database (of all places):
http://www.bcdb.com/cartoon/78071-Judo_Sanka_(Series).html

Originally released in 1974.

"This TV series ran for 27 episodes.

Based on Hiroshi Kaizuka's manga.

The last TMS sports-themed anime series ("Star of the Giants" was the first).

Because of low ratings, the series was pulled off the air before later episodes of the original manga could be adapted."

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