Niti Piyapan was a very promising junior sprinter, at the age of 18 he competed in the Asian Games, and a year later he was a member of the silver winning Thai 4×100 m team at the Asian Championships, earning a place on the 1992 Olympic team. He was a member of the team until 1998, winning two silver medals and one bronze in regional Championships or Games. His best distance was 200 m, in 1993 he run av PB of 20.93 and competed in the World Championships.
Personal Best\: 100 – 10.54 (1994).
|1992 Summer||20||Barcelona||Athletics||Men's 4 × 100 metres Relay||Thailand||THA||6 h2 r2/3|
|1992 Summer||20||Barcelona||Athletics||Thailand||THA||Semi-Finals||Heat Two||6||39.73|
|1992 Summer||20||Barcelona||Athletics||Thailand||THA||Round One||Heat Four||3||QU||39.91|