The open category was a judo event held as part of the Judo at the 1964 Summer Olympics programme. The weight class allowed judokas of any weight. The competition was held on Friday, October 23, 1964.
United Team of Germany
The nine competitors were divided into three pools of three. Each pool played a round-robin tournament, with the winner of the pool advancing to the semifinals. The second-place judoka in each group moved on to a relegation pool, in which the three of them played another round-robin with the winner becoming the fourth semifinalist.
|1||Anton Geesink (NED)||2–0|
|2||Akio Kaminaga (JPN)||1–1||QR|
|3||David Petherbridge (GBR)||0–2|
|1||Theodore Boronovskis (AUS)||2–0|
|2||John Ryan (IRL)||1–1||QR|
|3||Ali Hachicha (TUN)||0–2|
|1||Klaus Glahn (EUA)||2–0|
|2||Ben Nighthorse Campbell (USA)||1–1|
|3||Thomas Ong (PHI)||0–2||QR|
|1||Akio Kaminaga (JPN)||2–0|
|2||John Ryan (IRL)||1–1|
|3||Thomas Ong (PHI)||0–2|
The remaining four judokas competed in a single elimination bracket. Both losers in the semifinals won bronze medals. Kaminaga, who had advanced through the repechage, defeated Glahn to earn a rematch against Geesink. Geesink, who had defeated the Japanese judoka in the first round, did so again in the final match.
|1||Anton Geesink (NED)||Sasae-tsuri-komi-ashi|
|4||Theodore Boronovskis (AUS)||0:12|
|Anton Geesink (NED)||Kesa-gatame|
|Akio Kaminaga (JPN)||9:22|
|3||Akio Kaminaga (JPN)||Tai-otoshi|
|2||Klaus Glahn (EUA)||4:10|
Campbell would go on to serve in the United States Senate.
- Tokyo Organizing Committee (1964). The Games of the XVIII Olympiad: Tokyo 1964, vol. 2.
- "Judo at the 1964 Tokyo Summer Games: Men's Open Class". Sports Reference. Archived from the original on 18 April 2020. Retrieved 7 May 2018.