[1] Koura was the first Malaysian Open champion in 1964 (the event replaced the Malaya Championships).

[2] Koura played in the main draw of the 1967 French Championships and was runner up at the 1971 Tokyo Indoor.

In the early 1970s he was a member Japan's Davis Cup team, featuring in three ties as a doubles player.

This included a win over Australia in Tokyo in 1971, which was the first time in 50 years the Japanese had defeated the Australians.

[3] Koura opened up a tennis college in Osaka in the mid-1970s, which has produced players such as Kimiko Date and Yuko Hosoki.