The hot-hitting Fighters continued their winning ways against the feckless Lions, and added insult to injury in their opponents' backyard.
Kazuhito Tadano threw six shutout innings, and Hokkaido Nippon Ham knocked Seibu's lights out in a six-run seventh en route to a 13-0 blowout to extend its winning streak to three games on Monday night.
Playing in front of a sparse crowd of 12,077 in Saitama Prefecture, last-place Seibu remained winless at home and fell to its second loss in a row. Nippon Ham improved to 3-1 against Seibu this season.