In 1982, Ang Peng Siong set a world record at the US Swimming Championships with a time of 22.69 sec in the 50m freestyle. In the same year he won the gold in the 100m freestyle at the Asian Games in New Delhi. He was crowned Sportsman of the Year from 1983 to 1985. Ang won golds at the SEA Games in 1983 and 1985 for the 100m. He also took the golds in the 1991 and 1993 SEA Games for the 50m freestyle.