This is a bout from a while ago -- likely in the early 2000s. I can't say when, exactly, but it's old enough to be included in a Onesongchai collection (look to the bottom left of the recording). Also, Saenchai is obviously younger and lighter than he is now. The profiles given before the match give what would now be an outdated accounting of Saenchai's Lumpini titles, omitting the heavier categories he's been champion in.
I don't know anything really about his opponent, though he is obviously very skilled at Muay Thai. Many Thai English rules boxers started out as nak muay, and he obviously had a career in Muay Thai before switching to English style. The video notes he is a boxing gold medalist (in amateur English boxing, of course).
The poster lists Saenchai's second name as Sor Kingstar in this video and I'll defer to the posting, but I suspect he may still be going by Sor Khamsing here, since Somrak is issuing instructions to him. I can't tell if Somrak is actually in his corner, though.
Saenchai wears the blue shorts in this bout, and Sresatchanalai wears red.
