In addition he won the bronze medal in singles at the 1959 Southeast Asian Peninsular Games held in Bangkok, Thailand.

[8] He reached the final of the Hoylake and West Kirby Open where he was beaten by the South African player David Samaai.

[9] In 1953 he reached the final of the Malaysian International Championships held in Singapore where he lost to the Australian Neale Fraser in straight sets.

[11] Ong also won the bronze medal in singles at the 1959 Southeast Asian Peninsular Games held in Bangkok, Thailand.

[12] Ong went onto become a notable national amateur golfer playing left handed where he won the 1967 Putra Cup team title.