Sunao Okamoto (岡本 忠, Okamoto Sunao; 1 September 1894 – 2 September 1955) was a Japanese male tennis player who represented Japan in the Davis Cup and the Olympic Games. He competed at both the Wimbledon Championships and U.S. National Championships in 1924. He won 9 career singles titles at tournaments maninly played in India.
Source: “Sunao Okamoto”, English Wikipedia (CC BY-SA 4.0), excerpt