Ryuki Miki was born in Takamatsu. During his studies at the Kobe Higher Commercial School, he played for the collegiate tennis team. There he was approached by Tomiko Ataka, daughter of owner of the trading corporation Ataka and Company. Tomiko asked Miki to be her tennis coach. Miki became an employee at Ataka and Company and at the late 1920s was sent to London. Officially his assignment was to assist the local company representative Kyutaro Izaki, but in fact he was supposed to be a companion and personal assistant to Eiichi Ataka, the heir of the company and talented artist who was taking piano lessons in London, as well as his wife Michiko, another classmate of his. While in London, Miki frequently played in amateur tennis tournaments. At Wimbledon Championships he played six times in a row, from 1929 to 1934, and four times ascended there to the third round in singles competition. He also reached quarter-finals twice in 1932 and 1934. In 1932 he and another Japanese playerJiro Sato defeated in the third round second seeded Australians Jack Crawford and Harry Hopman, and in 1934 Miki, pairing with South AfricanVernon Kirby eliminated in the second round Crawford and Adrian Quist who were fourth-seeded at the time. But Miki's main success was achieved in mixed doubles. With the Briton Dorothy Round whom he was coaching and partnering since 1931 Miki first reached Wimbledon quarter-finals in 1933, and the next year they won the mixed doubles tournament, making Ryuki the first Japanese player in history to win a Grand Slam event. At lesser British tournaments, with not so many strong opponents, Miki was a frequent singles finalist. Among others he won tournaments in Croydon and Eastbourne, Birmingham, Edgbaston and Melbury. The Weybridge championships in St Georges Hill Miki won three times, in 1929, 1930 and 1933, also winning twice the Sheffield and Hallamshire Championships. In addition to tournaments on the British soil Ryuki Miki also took part in other competitions in Europe. He played three times at the French Championships, reaching third round in 1933. In 1932 he played for the Japan Davis Cup team in the European zone and won all three his rubbers partnering Jiro Sato, including European semi-final tie in Italy; the Italians eventually won the match 3:2. In February 1934 Tatsuyoshi Miki was appointed the non-playing captain of the JapanDavis Cup team but the death of the team leader Sato left the Japanese without any chances in their first round European tie against the Australians which ended with a bitter 4:1 loss. Ryuki Miki himself retired from tennis after 1934, and died in Tokyo.
