Toshiaki Okamura (岡æ ä¿ÂæÂÂ; 4 May 1912 â 25 January 1996), also known as Yeh Tien-sung (), was a Taiwanese baseball outfielder who played for the Nankai Hawks of the Japanese Baseball League (JBL) from 1939 to 1949.
Born in Karenkà  Prefecture, Taiwan, Okamura was a member of the famed Noko baseball team made up of Taiwanese indigenous players. In 1929, he moved to Kyoto and attended Heian Junior High School. During his time at Heian, he played in 9 Kà Âshien baseball tournaments, reaching the final in 1933.
Okamura attended Nihon University.
In 1939, Okamura joined Nankai Club. Having mainly played as catcher, he was assigned to play outfielder at Nankai.