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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reijiro Yamaguchi | 1-2016 | 4 | 4 | .500 | 5.21 | 39 | 11 | 0 | 0 | 1 | 103.2 | 80 | 60 | 7 | 80 | 100 |
| Yoshiki Yamaguchi | 2-2028 | 15 | 16 | .484 | 5.44 | 140 | 23 | 0 | 0 | 27 | 249.2 | 264 | 151 | 16 | 168 | 192 |
| Yoshino Yamaguchi | 0-0 | 2 | 1 | .667 | 3.62 | 31 | 0 | 0 | 0 | 1 | 54.2 | 52 | 22 | 11 | 16 | 41 |
| Kazuyuki Yamamoto | -1-0 | 1 | 3 | .250 | 11.60 | 19 | 8 | 1 | 0 | 0 | 52.0 | 91 | 67 | 10 | 50 | 44 |
| Koryusai Yamamoto | -1-0 | 13 | 13 | .500 | 5.96 | 197 | 0 | 0 | 0 | 32 | 312.1 | 346 | 207 | 54 | 191 | 297 |
| Terumoto Yamamoto | 14-2026 | 52 | 49 | .515 | 5.35 | 297 | 132 | 1 | 0 | 10 | 974.0 | 1068 | 579 | 98 | 510 | 959 |
| Tsukasa Yamanoue | 7-2019 | 35 | 33 | .515 | 5.32 | 115 | 100 | 0 | 0 | 2 | 571.1 | 587 | 338 | 64 | 330 | 570 |
| Kazutoshi Yamasaki | 0-2108 | 0 | 3 | .000 | 6.75 | 3 | 3 | 0 | 0 | 0 | 14.2 | 16 | 11 | 4 | 7 | 13 |
| Coco Yamashita | 2-2024 | 12 | 9 | .571 | 3.45 | 140 | 0 | 0 | 0 | 59 | 140.2 | 135 | 54 | 12 | 49 | 138 |
| Kenshin Yamashita | 4-0 | 0 | 0 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 2.2 | 3 | 2 | 0 | 1 | 0 |
| Momoru Yamashita | 0-4 | 0 | 0 | .000 | 5.48 | 11 | 0 | 0 | 0 | 2 | 21.1 | 18 | 13 | 1 | 12 | 13 |
| Nobuhisa Yamashita | 0-0 | 5 | 3 | .625 | 3.52 | 51 | 0 | 0 | 0 | 33 | 53.2 | 40 | 21 | 6 | 29 | 77 |
| Reynaldo Yánez | 0-0 | 0 | 0 | .000 | 4.70 | 7 | 0 | 0 | 0 | 0 | 7.2 | 6 | 4 | 2 | 2 | 8 |
| Apupa Yavar | 4-2028 | 29 | 26 | .527 | 4.91 | 96 | 77 | 2 | 2 | 0 | 450.2 | 474 | 246 | 56 | 218 | 371 |
| Chong-su Yi | 1-2028 | 7 | 7 | .500 | 3.08 | 90 | 0 | 0 | 0 | 35 | 90.2 | 62 | 31 | 4 | 54 | 104 |
| Tulon Yildizoglu | -1-0 | 4 | 12 | .250 | 9.48 | 42 | 23 | 0 | 0 | 1 | 136.2 | 203 | 144 | 23 | 117 | 106 |
| Hiroya Yoshida | 4-2024 | 26 | 18 | .591 | 5.04 | 56 | 56 | 1 | 0 | 0 | 348.1 | 393 | 195 | 54 | 98 | 292 |
| Noburo Yoshida | 0-0 | 2 | 1 | .667 | 3.98 | 36 | 0 | 0 | 0 | 1 | 61.0 | 58 | 27 | 7 | 43 | 55 |
| Tsunesaburo Yoshida | 1-2 | 24 | 33 | .421 | 6.17 | 166 | 68 | 0 | 0 | 6 | 479.2 | 529 | 329 | 60 | 301 | 415 |
| Sawao Yoshimura | 0-3 | 7 | 6 | .538 | 3.60 | 101 | 0 | 0 | 0 | 13 | 90.0 | 80 | 36 | 14 | 38 | 84 |
| Haruki Yoshino | 0-0 | 8 | 2 | .800 | 4.16 | 94 | 0 | 0 | 0 | 4 | 149.1 | 138 | 69 | 17 | 65 | 167 |
| Rob Young | 4-2028 | 12 | 12 | .500 | 4.87 | 42 | 42 | 0 | 0 | 0 | 216.1 | 232 | 117 | 30 | 59 | 234 |
| Ju-wei Yuan | 2-2024 | 18 | 18 | .500 | 5.47 | 335 | 15 | 0 | 0 | 13 | 395.0 | 408 | 240 | 83 | 162 | 557 |
| Ed Yuke | 0-2023 | 2 | 6 | .250 | 7.90 | 22 | 14 | 0 | 0 | 0 | 84.1 | 107 | 74 | 10 | 62 | 89 |
