One of the many contenders lost in the depth of the division is Suguru Muranaka, the current Japanese champion is ranked by all 4 world title bodies and is viewed, by those in the know, as a genuine fringe contender if even if those outside of Japan haven't even heard of him.
Muranaka's most notable fight came in December 2013 when he took on fellow contender Takuya Kogawa in a bout the Japanese national title. It was genuinely a competitive contest and a bout that helped both men enhance their standing in the sport. If you've not had the chance to see it, here you go, watch 2 of the Flyweight division's under-rated contenders in action against each other.
Following this bout Kogawa would fight Yodmongkol Vor Saengthep in a WBA interim world title fight. If you've not seen that it's well worth watching to further show how good Kogawa is.
(Video courtesy of 村中優後援会)