The reigning champion Hamamatsu Higashimikawa Phoenix used their bench early and often in a 119-57 thrashing of the host Hiroshima Lightning on Saturday.
Phoenix coach Tomoya Higashino only used one player for more than 25 minutes in the series finale in Yamaguchi.
Big man Atsuya Ota, a Japan national team center, logged 33 minutes, 24 seconds of court time, contributing 18 points and 13 rebounds.