Thai boxer Chatchai-decha lost 3-2 to Cuba's Lazaro Alvarezoses in a quarter-final bout at the Tokyo Olympics on Sunday, capping a disappointing day for Thailand.
The veteran boxer suffered early exits at the Olympics in London 2012 and Rio 2016. Now aged 36, the Tokyo Games could be his last.
Chatchai-decha would have been guaranteed at least a bronze medal had he beaten Alvarez.
Earlier, Jutamas Jitpong lost to Turkey's Buse Naz Cakiroglu in a quarter-final bout in the women's flyweight (51kg) division, dampening Thai hopes of adding to the gold medal won by taekwando champion Panipak Wongpattanakit.