Background
Kumamaru Jiro was born in 1921 in Fukuoka Prefecture, Japan.
Kumamaru Jiro was born in 1921 in Fukuoka Prefecture, Japan.
In 1943, Kumamaru Jiro graduated from Keio University.
Kumamaru Jiro was tennis champion of Japan (1949-50) and the following year participated in the Davis Cup. In 1957, he was manager of Japan's Davis Cup Team.
