On paper it may not immediately look like an upset but Matsumoto was widely expected to win. He was the more proven fighter, he was at home, ranked by the OPBF and although he had lost several bouts his losses had come to fighters like Yu Kawaguchi and Jaesung Lee.
Matsumoto started well though Kim was a determined opponent and refused to just lose. Instead Kim showed his resilience, his toughness and his will to win before finally grinding down Matsumoto forcing the referee to save the 23 year old Japanese fighter in the 9th round.
The victory for Kim, his biggest so far, was his second victory in Japan having beaten Masatoshi Tomita a year ago and saw him winning his first title. For Matsumoto, who was attempting to claim his second professional belt, it seems a case of going back to the drawing board and possible deciding whether he wants to be a Featherweight or a Super Bantamweight.
(Image courtesy of http://www.boxing.co.jp)