Although he won the title last year Yamanaka was still somewhat of an unknown, and lacked the wider attention that many other Japanese world champions were getting. Today however he made a statement, and opened the eyes of many as he dominated the very solid Moises Calleros (28-8-1, 16), and forced the Mexican to retire after round 8.
Yamanaka looked sharp as a tack from the opening round. He was quick, smart and beating Calleros to the punch. Not only was he landing his own shots regularly but he wasn't taking much return fire, with Calleros looking slow, clumsy and awkward.
The success of Yamanaka continued from round 1, to round 2 and then grow round after round. He not only showed he could box and move, as he began to show incredible variation in his work. Standing his ground and countering, slipping shots just outside the pocket, and pressing Calleros who seemed to begin questioning himself very early on.
By round 4 it looked like Yamanaka's only problem's could be that he might slow down, or that he could be caught by a single bit shot. But he looked so relaxed, so calm and so confident that neither of those things looked likely. Instead he seemed to to just build on what he was doing, landing some more telling right hands up top, nasty uppercuts and hurtful body blows. There no answer from Calleros who was looking a like a fighter who simply hadn't got a game plan for Yamanaka or his movement.
Going into round 8 the bout looked a foregone conclusion, but given Calleros' toughness and Yamanaka's relative lack of power it looked like we'd be going the distance. Surprisingly however Yamanaka hurt Calleros, and then went on the hunt, picking the challenger apart with accurate and hard shots. Calleros looked like a spent fighter, out of ideas and out of energy and both fighters knew it. Yamanaka went for the finish but couldn't find it in the ring. It wasn't to matter however as Calleros retired in his corner following the round.
With the win Yamanaka legitimised his reign almost instantly, and whilst he is the newest of the world champions at 105lbs he looks to be the most pure boxer at the top of the division and could be the divisional dark horse given how sensational he looked here.