Thailand has a very strong all-time top ten.
The name you generally see at the top is Khaosai Galaxy, the barrel-chested bomber who somehow was able to make 115 and knocked everyone out.
From an accomplishment-point-of-view, hasn't current Flyweight Champion Pongsaklek Wongjonkam eclipsed him? One loss thrice avenged over 80 fights (15 yrs) and a decade-long run as a flyweight titleholder?
Pong lacks some big names on his resume that other standout Thai fighters have, like Chartchai Chionoi, Pone Kingpetch, and maybe even Sahaprom. Then again, he did beat a lot of challengers who later went on to snag "belts." He doesn't jump off the screen and captivate like Galaxy. But off of achievements, can you make a case for him being #1?
As an aside, which of these 3 Thai flyweights would you rank first: Kingpetch, Chionoi, or Chitalada?
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