The 1975 Japan Open Tennis Championships was a combined men's and women's tennis tournament played on hard courts. The men's events were part of the 1975 Commercial Union Assurance Grand Prix and took place at the Denen Coliseum in Tokyo, Japan. The tournament was held from 2 November through 8 November 1975. Raúl Ramírez and Kazuko Sawamatsu won the singles titles.[1]
Raúl Ramírez defeated Manuel Orantes 6–4, 7–5, 6–3
Kazuko Sawamatsu defeated Ann Kiyomura 6–2, 3–6, 6–1
Brian Gottfried / Raúl Ramírez defeated Juan Gisbert Sr. / Manuel Orantes, 7–6, 6–4
Ann Kiyomura / Kazuko Sawamatsu defeated Kayoko Fukuoka / Kiyomi Nomura 6–2, 6–3