One of those fighters that has been helping tune up Yamanka is is 23 year old world ranked contender Marlon Tapales (27-2, 10). Although little known outside of Asia Tapales proved his ability in 2013 when he gave Mexican Super Flyweight David Sanchez all he could handle in a very competitive contest for the WBC silver Super Flyweight title. Although much smaller than Moreno, Tapales has got the southpaw stance like the Panamanian and is a a solid and credible fighter for sharpening world skills with.
The other is Mark Anthony Geraldo (31-6-3, 14), a 24 year old fringe contender. Geraldo came to the attention of many western fans last year when he faced Efrain Perez and showed some wonderful skills en route to a 6 round decision win. Since then however Geraldo has lost twice, with the most recent of those coming in Japan to Takuma Inoue in OPBF title fight. Talented with good handspeed and combinations Geraldo is also a very good fighter to test world class skills against.
Much of the sparring so far has seen Yamanaka focus on using his right jab, a punch that many feel he has under-used in recent times. It seems like he has realised that that punch could be a key weapon here, as could his body shots which we are also said to have been a focus in his recent sparring sessions.