In 1929 he was transferred to Mitsui Life Insurance Co., became the manager of Kobe Branch, in 1945 the director thereof and thereafter was expelled from his official position after World War II.

While having this educational background and career he reached the All-Comers final of the Wimbledon Championships in 1920, where he lost to Bill Tilden 4–6, 4–6, 11–13.

In 1921 he won the singles title at the Queen's Club Championships by defeating Mohammed Sleem in the final in straight sets.

His forehand grip was described as 'faulty' but nevertheless his passing shots, which he hit low and with topspin, were judged as excellent.

[3] In his book The Art of Lawn Tennis Bill Tilden describes Shimuzu as a baseline player and marvelous court coverer with an uncanny accuracy in his shots.