Tatsuya Imai came out on top in a rookie pitching duel Sunday as the Seibu Lions’ lineup slugged early against the SoftBank Hawks for an 8-5 win in the Pacific League.

Imai (5-4) fanned four and yielded three runs at MetLife Dome. The right-hander, who was the Lions’ first round pick in the 2016 draft, was bolstered by back-to-back four-run innings.

SoftBank left-hander Kotaro Otake (2-1) allowed eight runs in 1⅔ innings and suffered his first loss of the season.

Hawks leadoff man Taisei Makihara singled against Imai in the first and advanced to second on a sacrifice bunt, but right-fielder Yuji Kaneko displayed some early heroics with a spectacular diving catch of a fly ball from Akira Nakamura.

Imai fanned cleanup batter Yurisbel Gracial to end the threat.

In the bottom of the inning, Sosuke Genda’s RBI triple off Otake spearheaded a four-run rally. Hideto Asamura doubled in Genda to make it 2-0, and Hotaka Yamakawa’s two-run homer doubled the Lions’ lead.

In the second, Kaneko drew a walk from Otake and stole second, and Genda singled to right for his second RBI of the game. Otake then yielded back-to-back hits, including one to Yamakawa allowing Genda to wheel home again.

Otake was relieved by fellow SoftBank rookie Rei Takahashi with runners on first and third following a groundout. The submarine right-hander immediately gave up a two-run RBI double to Takeya Nakamura and the PL-leading Seibu doubled their score again for an early 8-0 lead.

Imai got into a two-out jam in the third after giving up two straight hits and allowed a run on a wild pitch. He yielded a leadoff double to Gracial and issued a walk in the fourth, and allowed the Hawks to close the gap on Kenji Akashi’s two-run knock to right field.

A close out at first was deemed safe in the top of the sixth, overruling a double play and putting runners on the corners. Imai was replaced by recently-acquired Seibu lefty Ryuya Ogawa, who put out the fire with an inning-ending strikeout.

Seibu reliever Shogo Noda pitched a scoreless seventh, but Kyle Martin allowed a run in the eighth.

Deunte Heath loaded the bases in the ninth on three straight singles, but fanned two and coaxed a groundout over the next four batters to limit the damage. Nobuhiro Matsuda batted in the Hawks’ final run.

Takahashi, Livan Moinelo and Shuta Ishikawa allowed three hits in a combined 6⅓ scoreless innings for SoftBank.

In warm-ups before the game, Hawks outfielder Yuki Yanagita was hit by a batted ball and suffered a bruise on the left side of his head. Yanagita was taken by ambulance to a nearby hospital, where it was revealed no concussion or bone fracture had occurred.

Buffaloes 8, Fighters 4

At Sapporo Dome, Yuki Nishi (9-12) fanned three and scattered five hits, allowing two runs in five innings. Yuma Mune and Kenya Wakatsuki drove in two runs each, while Nick Martinez (10-9) gave up six runs and took the loss.

Eagles 3, Marines 1

At Zozo Marine Stadium, last-place Rakuten overturned Lotte’s early lead on a sac fly and a two-run shot by Yasuhito Uchida in the fourth. Takayuki Kishi fanned nine and improved to 11-3, while Yuki Matsui became the youngest player to earn 100 career saves after fanning three in the ninth.

CENTRAL LEAGUE

Tigers 20, BayStars 4

At Yokohama Stadium, Shintaro Fujinami (3-3) earned the win and hit his second career home run: a grand slam off lefty Kenjiro Tanaka. Yusuke Oyama went 6-for-6 with seven RBIs and three homers, including two in the third that bookended the first of two nine-run rallies, as Hanshin pounded the Baystrars into last place. Yoshitomo Tsutsugo hit his 35th homer of the season, the second highest in the league.

Giants 11, Dragons 3

At Tokyo Dome, Shinnosuke Abe drove in four runs, including a seventh-inning grand slam, and left-hander Nobutaka Imamura (6-2) picked up the win for pitching five-plus innings as Yomiuri defeated Chunichi.

Carp 4, Swallows 2

At Jingu Stadium, Seiya Suzuki opened the scoring with a sacrifice fly and Xavier Batista blasted a three-run homer in Hiroshima’s four-run first inning. The CL-leading Hiroshima reduced the magic number to clinch the pennant to four after beating Yakult, currently in second place.