Sakata fought at Korakuen Hall .
Sakata took the fight to Okada from the opening bell with sharp left jabs and sizzling left hooks to the head leaving Okada unable to answer the bell for the eighth round of a scheduled 10 - rounder .
Fighting at Korakuen Hall , Sakata took the fight to Okada from the opening bell with sharp left jabs and sizzling left hooks to the head leaving Okada unable to answer the bell for the eighth round of a scheduled 10 - rounder .