Takahiro Saeki, Shuichi Murata and Hitoshi Tamura each delivered two-run homers as the Yokohama BayStars churned out 17 hits to send the Yomiuri Giants to their fifth loss in six games with a 14-6 rout on Thursday.
Saeki drove in six runs on a 4-for-5 night while Tatsuhiko Kinjo also had four hits with three RBIs in a Central League game at Yokohama Stadium.
Southpaw Yoshihiro Doi (1-0) got plenty of support over the distance to earn his first complete-game victory in his eighth pro year, despite allowing 13 hits and six runs.
Yokohama broke a 1-1 tie with a five-run fourth and took a comfortable 8-1 lead by the fifth.