A day after clinching the Central League title, the Chunichi Dragons beat the Tokyo Yakult Swallows 4-1 in their final home game of the regular season on Wednesday.
Kazuki Yoshimi (18-3) threw two perfect innings from the bullpen to earn his CL-leading 18th win and reduce his league-best ERA to 1.65.
The Yomiuri Giants' Tetsuya Utsumi is second in both categories with 17 wins and a 1.74 ERA.
Without most of their regulars in the lineup, the Dragons built a 4-0 lead through four innings at Nagoya Dome.
Backup catcher Keiji Oyama opened the scoring with an RBI triple and scored on a sacrifice fly by Yohei Oshima for a 2-0 lead in the third.
Chunichi made it 4-0 in the fourth when veteran Takahiro Saeki followed a Ryosuke Hirata run-scoring triple with a base hit.
Swallows starter Katsuki Akagawa (6-3) gave up two runs in three innings.
Both teams each have one game remaining in the season.
BayStars 2, Tigers 1
At Nishinomiya's Koshien Stadium, Yoshitomo Tsutsugo singled in the go-ahead run in the sixth inning, leading Yokohama over Hanshin for its first win in six games.
PACIFIC LEAGUE
Eagles 5, Marines 2
At Sendai's Kleenex Stadium, rookie Takahiro Shiomi (9-9) pitched his fourth complete game of the season as Tohoku Rakuten topped Chiba Lotte.
Luis Garcia drove in two runs with a double and a sac fly. Hiroki Ueno (4-7) was roughed up for five runs in 4⅔ innings.