That recognition has come with the Magazine, which is often referred to as "The Bible of Boxing", placing Yamanaka in to the #10 spot of the Pound-for-Pound top 10 listing.
From what we understand it's the second time a Japanese fighter has been included in the rankings following Hozumi Hasegawa's inclusion, with the "Ace of Japan" once being ranked #9. The rankings have however regularly featured other Asian fighters, including the likes of Khaosai Galaxy, Myung-Woo Yuh, Sung-Kil Moon, Manny Pacquiao, Nonito Donaire, Pongsaklek Wonjongkam and Gennady Golovkin.
Whilst it's a step in the right direction from Ring Magazine in recognising Japanese fighters it does seem like a step has taken far too long for them to take. Hopefully they'll begin to recognise more of the fighters form he country in the near future.
Interestingly Yamanaka's Teiken stablemate Roman Gonzalez is currently ranked #2 behind Floyd Mayweather Jr.
Notably 4 Asian fighters are recognised as the top in their division by Magazine. They are Donnie Nietes (Light Flyweight), Naoya Inoue (Super Flyweight), Yamanaka (Bantamweight) and Takashi Uchiyama (Super Featherweight).
(Image courtesy of Teiken.com)
*Note- Japanese promoted Yuri Arbachakov was ranked by Ring Magazine, though was of course a Russian fighting out of Japan