On March 3rd 2012 Iwasa made the first defence of the Japanese Bantamweight title as he took on the tough and under-rated Yuki Murai. At the time Murai had a disappointing record though was in the form of his life with 7 wins in his previous 9 and only 2 controversial losses. As well as being in form Mukai had never been stopped despite being in the ring with fighters like Chatchai Sasakul, Somsak Sithchatchawal and Pichit Chor Siriwat.
The fact Murai had never been stopped din't prevent Iwasa from taking him out inside a round with a single left hand. The finish is eye catching from Iwasa though is genuinely comical from Murai who tries to ready himself before toppling over for a second time.
Oddly this is the only video on the Celes Gym channel. It's a shame Celes don't upload more of their footage as they have plenty available from the likes of Iwasa and Tetsuma Hayashi as well as the promising, though very inexperienced, Koki Koshikawa.
(Video courtesy of Celes Gym)