Thammanoon Niyomtrong has one loss against one opponent on his boxing record. For a list of Niyomtrong's best fights, refer to "Best fights of Thammanoon Niyomtrong".
On November 16, 2024 Thammanoon Niyomtrong, the WBA champion, met Oscar Collazo, the WBO and The Ring champion, in a strawweight world-title unification fight. Niyomtrong was 34 years old and with a record of 25-1 (9), and Collazo was 27 years old and with a record of 10-0 (7). Niyomtrong lost the fight via 7th-round TKO and lost his title.
