Avalos was simply too strong for the Japanese fighter who had never previously been stopped. The American was able to walk through the shots of the Japanese fighter and managed to beat him down force the referee to stop the action.
The bout, an IBF Super Bantamweight title eliminator, was being fought to decide the next challenger for Kiko Martinez, who recently defeated Hozumi Hasegawa. Sadly for IShimoto he won't be able to avenge Hasegawa's loss.
Also on the under-card Korean Super Middleweight champion Eun Chang Lee (7-4, 3) was defeated. Lee was fighting Brazilian star Esquiva Falcao (3-0, 1), a former amateur rival of Ryota Murata, and although he went the distance with the Brazilian Lee did put up a good effort taking Falcao the distance.