The challenger had been regarded as a no hoper by fans but came to the ring exuding some real confidence and that showed as he looked to press Yamanaka with an aggressive pressure style. Unfortunately for the challenger it was a style that Yamanaka had seen before and gave him real openings for his vaunted left hands. Those left hands landed with regularity during the first 3 minutes, but they never seemed like full blooded shots and they never really seemed to hurt the challenger.
It was more of the same, for the most part, in round 2, though Carlson did seem to be visibly hurt for the first time by a left hand, an also suffered a cut from one of those left hands. Although looking worse for wear Carlson did seem to get inside a few times, and neutralised the left hand of the champion every so often, but paid the price when he wasn't quick enough.
Carlson began to be visibly broken down in round 3 as Yamanaka moved out of first gear and hurt the Mexican several times, landing some really hurtful body shots that seemed to take the wind out of Carlson. It was a slow but progressive beat down from the champion who looked several levels above the challenger. Despite being battered Carlson showed grit and came out for round 4 with his now standard aggressive march, and for once he had some real notable success landing a right hand. It was his best round, but one that he again failed to win having taken several big lefts himself.
In Japan the WBC open scoring is used and unsurprisingly Yamanaka was leading on all 3 cards, up 40-36 on two of them and surprisingly 39-36 on the other, leaving some to wonder which judge needed to see an optician.
Yamanaka seemed to take the fact that Carlson had been awarded a round personally and dominated round 5, dropping Carlson twice in close succession. It seemed like Carlson was there for the taking but instead of close the show Yamanaka backed off. Carlson then showed solid recuperative powers as he not only got his senses back but went on to buckle Yamanaka with right hands, twice. It seemed as if the wild desperate swings were a danger for the champion who shouldn't have taken his foot off the gas, and suffered a small graze around his left eye as a result.
It seemed even the champion realised he had to take this more seriously and dropped Carlson again in round 6, before Carlson came back at him and again landed a big right hand that seemed to show there was still danger in the Mexican if Yamanaka was going to carry him. Thankfully in round 7 the champion had had enough and went for the finish, dropping Carlson early in the round and this time he jumped on his man, seeking the finish. A 5th knockdown, just moments later, forced the referee to wave off the bout and saved the game but totally out matched challenger.
As a huge favourite Yamanaka did what he had to, and stopped Carlson to put the expected cherry on the result, but the performance it's self left some questions and would have left some wondering if he's fading as a fighter, or if he just didn't take Carlson seriously. The wild right hands he took in round 5 did seem to wobble him and against a world class puncher he may well have been decked. His lack of urgency when he had Carlson hurt in round 5 was disappointing, and the power in his left hand looked less destructive than it had in the past. Again they are minor flaws with his performance, a performance that saw him end a 22 fight winning streak from Carlson by dropping the Mexican 5 times, but they are flaws that may need correcting if defense #13 is set to be a big one as some suspect.
For Carlson it's likely he will return to the lower leagues, racking up wins in the US and Mexico against relative no hopes as he had previous to this bout.