The Fukuoka SoftBank Hawks clinched a postseason berth on September 19, their sixth straight. After failing to overtake the Lions in the final week of the season, the Hawks were ensured home field advantage in the First Stage of the Climax Series. The Tohoku Rakuten Golden Eagles clinched a third-place finish and a spot in the Climax Series on September 24. It was their first postseason appearance in two years. The Hawks were 13–12 against the Eagles during the regular season.
Series summary
Game 1
The Eagles quickly took the lead in the top of the first inning with a solo home run by Hideto Asamura off of Hawks' starting pitcherKodai Senga. SoftBank quickly responded in the bottom of the same inning with a solo home run of their own by Kenta Imamiya off of Eagles' starter Takahiro Norimoto. In the bottom of the next inning, Seiichi Uchikawa's two-run home run gave the Hawks the lead. However, Rakuten continued to score and eventually took the lead after three solo home runs in three separate innings: the third, fifth and seventh. In the top of the ninth inning, Hiroaki Shimauchi walked and then advanced to third base after a wild pitch and a throwing error. Asamura gave the Eagles an insurance run when he singled to drive Shimauchi home, the only run inthe game scored via a method other than home run. Eagles closerYuki Matsui retired all three Hawks' batters in the bottom of the ninth inning to record the save.
Game 2
After the Eagles scored a run in the top of the first inning, the Hawks again followed suit, tying it up in the bottom of the inning via Yuki Yanagita's solo home. In the bottom of the third, Yanagita again tied the game with an RBI double after Asamura hit a solo home run in the bottom of the inning. Alfredo Despaigne' two-run homer later that same inning briefly gave the Hawks the lead. After Hawks starter Rick van den Hurk was removed with two outs in the forth inning, reliever Shinya Kayama walked two batters. Asamura then tied it up by singling in two runs in the fourth, collecting two more RBIs. Shuhei Fukuda broke the 4–4 tie with a solo home run in the bottom of the fourth inning, putting the Hawks ahead for good. They added an insurance run in the fifth when Despaigne singled in Yanagita. The Hawks bullpen kept the Eagles scoreless from the fifth inning on to secure the win.
Game 3
Unlike the previous two games in the series, scoring in Game 3 didn't start for either team until the fourth inning. Eagles' and Hawks' starting pitchers Takayuki Kishi and Rei Takahashi, respectively, kept both teams scoreless through the first three innings. Rakuten's Asamura scored the first run of the game with a solo home run in the top of the fourth. He homered in all three games and hit four home runs in total in the series. Kishi had not allowed a hit until giving up back-to-back singles to Despaigne and Yurisbel Gracial in the bottom of the inning. Seiichi Uchikawa then tied the game by driving in a run. The tie continued until the seventh inning, when Uchikawa homered off of Rakuten reliever Sung Chia-hao to give the Hawks the lead. The Hawks couldn't breakthrough in the remaining innings with SoftBank reliever Liván Moinelo and closer Yuito Mori keeping them scoreless to allow the Hawks to win and advance to the Final Stage of the Climax Series.
Final Stage
The Saitama Seibu Lions clinched the Pacific League pennant, their second straight, on September 24. The title also insured that the Lions would be awarded both a one-game and home field advantages in the Final Stage of the Climax Series. At the end of the season, the Lions battled the Fukuoka SoftBank Hawks, who finished the season only two games behind, for the league title. This Final Stage series was a rematch of last year's PLCS Final Stage series in which the Hawks defeated the pennant-winning Lions to advance to the Japan Series. During the regular season, Seibu went 12–13 against the Hawks.
