The talented Japan fighter, fighting in his first 10 round bout, was given his biggest test so far though scored an impressive unanimous decision win with scores of 97-91 and 96-92, twice.
Early on it was the visitor who looked the boss with Sumalpong getting off to a great start.
The unheralded Filipino fighter claimed the first round and dropped Ken Shiro in the second round. For a moment it looked like the expectation on Ken Shiro's shoulders was too much for the 23 year old novice.
Following the bad start the home fighter regrouped, almost immediately and from round 3 he began to settle, boxing and moving, using his jab and footwork. By the middle rounds he had fought himself into a narrow lead that grew as the fight went on. Whilst Ken Shiro was in the ascendency Sumalpong was faltering and his early start was all but forgotten by the start of round 10.
Sadly for the Filipino he went on to shame himself by biting Ken Shiro in the final round, getting a point deducted and putting a shadow on his performance which really should have actually been a building block for the previously unheralded fighter.
(Image courtesy of boxingnews.jp)