Player Directory
Chiba Lotte Marines
Koki Yamaguchi
Koki Yamaguchi
51
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Striking Power Index
OPS.757
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Slugging power index
ISO.217
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Baseball selection index
BB/K.135
*Fiscal year 2025
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position
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birthday
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age
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height
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body weight
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Birthplace
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Pitching and batting
right-handed pitcher / right-handed hitter
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Blood type
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Draft Year
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Biography
Meiso High School -Chiba Lotte Marines (Draft 4 '19~)
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Titles won
Videos
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15:23
Summary of the unsung heroes who protect first base supported by Nifco Inc.
2025年11月25日(火) 20:00
![[Miyazaki PL] The ball fell right in front of fielder! The Marines 'Koki Yamaguchi hits a game-winning double! October 26, 2025 Chiba Lotte Marines vs. Tokyo Yakult Swallows](https://img.youtube.com/vi/KtrflCUfPss/sddefault.jpg)
![[Miyazaki PL] A two-run leadoff home run!! The Marines 'Koki Yamaguchi creates a beautiful parabola in the Miyazaki sky!! October 26, 2025 Chiba Lotte Marines vs. Tokyo Yakult Swallows](https://img.youtube.com/vi/Wsw1fWmocB0/sddefault.jpg)
![[Miyazaki PL] The Marines 'Koki Yamaguchi makes a beautiful sliding catch of a ball that was about to fall into right field! October 19, 2025 Tohoku Rakuten Golden Eagles vs. Chiba Lotte Marines](https://img.youtube.com/vi/Y2TvyZMaeQ0/sddefault.jpg)
Participation results
hitter performance: By year
| year | Team | AVG | GP | PA | AB | H | 2B | 3B | HR | TB | RBI | R | SO | BB | HBP | SAC | SF | SB | CS | GIDP | SLG | OPS | ISO | ISOD | BB/K | BABIP | AB/HR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 |
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.207 | 78 | 228 | 203 | 42 | 3 | 1 | 9 | 74 | 20 | 20 | 53 | 25 | 0 | 0 | 0 | 0 | 1 | 5 | .365 | .658 | .158 | .087 | .472 | .234 | 22.56 |
| 2022 |
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.237 | 102 | 349 | 321 | 76 | 14 | 0 | 16 | 138 | 57 | 40 | 84 | 23 | 4 | 0 | 1 | 1 | 0 | 8 | .430 | .725 | .193 | .058 | .274 | .270 | 20.06 |
| 2023 |
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.235 | 115 | 474 | 421 | 99 | 21 | 0 | 14 | 162 | 57 | 46 | 122 | 43 | 5 | 0 | 5 | 0 | 0 | 7 | .385 | .695 | .150 | .075 | .352 | .293 | 30.07 |
| 2024 |
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.200 | 51 | 181 | 170 | 34 | 8 | 0 | 2 | 48 | 13 | 10 | 30 | 10 | 1 | 0 | 0 | 1 | 0 | 6 | .282 | .531 | .082 | .049 | .333 | .232 | 85.00 |
| 2025 |
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.255 | 35 | 112 | 106 | 27 | 2 | 0 | 7 | 50 | 24 | 11 | 37 | 5 | 0 | 0 | 1 | 1 | 1 | 3 | .472 | .757 | .217 | .031 | .135 | .317 | 15.14 |
| Overall record | .228 | 381 | 1344 | 1221 | 278 | 48 | 1 | 48 | 472 | 171 | 127 | 326 | 106 | 10 | 0 | 7 | 3 | 2 | 29 | .387 | .680 | .159 | .065 | .325 | .269 | 25.44 | |
2025/12/5 03:08 更新
article
![[Miyazaki PL] Koki Yamaguchi scores the opening run and takes the lead, but Chiba Lotte Marines loses narrowly](https://media.insight.pacificleague.com/webp/M41Qdy7TQvdcAFqiQpekBEX6mQLNhh4rMIbONTzY.webp)
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Four athlete guests have been selected for the "Patele Awards 2025"! Kiyotaka Nanbara will also appear as MC.
Pacific League Insight
2025.10.21(火) 14:50
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![[Miyazaki PL] Koki Yamaguchi Home Run the second consecutive game, Tokito Kawamura gave up two runs in the fifth inning.](https://media.insight.pacificleague.com/webp/XogP1LoOqU2NdFLTKKQs6fdrhTFfcKlfoASY1poG.webp)
[Miyazaki PL] Koki Yamaguchi Home Run the second consecutive game, Tokito Kawamura gave up two runs in the fifth inning.
Pacific League Insight
2025.10.17(金) 15:26
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Potential for hitter batting title: hitter who have not yet reached the required number of at-bats but are still performing well
Pacific League Insight Ryota Mochizuki
2025.9.3(水) 10:00
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