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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jason Jackson | 1-2018 | 11 | 9 | .550 | 6.22 | 58 | 29 | 0 | 0 | 0 | 196.2 | 257 | 136 | 34 | 94 | 164 |
| Ricky Jackson | 3-2027 | 16 | 18 | .471 | 5.00 | 50 | 50 | 2 | 1 | 0 | 300.1 | 353 | 167 | 29 | 104 | 163 |
| Ed Jacobs | 1-2025 | 10 | 11 | .476 | 4.45 | 53 | 21 | 0 | 0 | 4 | 190.0 | 209 | 94 | 15 | 96 | 111 |
| An Jang-Yop | 0-2026 | 2 | 3 | .400 | 4.05 | 29 | 0 | 0 | 0 | 13 | 26.2 | 22 | 12 | 1 | 20 | 34 |
| Gerd Jans | 0-2018 | 11 | 9 | .550 | 6.86 | 118 | 0 | 0 | 0 | 4 | 160.0 | 233 | 122 | 26 | 81 | 142 |
| Maxime Janssens | 0-2026 | 3 | 1 | .750 | 4.08 | 6 | 6 | 0 | 0 | 0 | 39.2 | 38 | 18 | 1 | 13 | 19 |
| Bill Jensen | 0-2017 | 0 | 1 | .000 | 6.75 | 11 | 0 | 0 | 0 | 1 | 13.1 | 19 | 10 | 3 | 7 | 12 |
| Edward Jensen | -1-2021 | 2 | 9 | .182 | 11.34 | 45 | 7 | 0 | 0 | 1 | 60.1 | 98 | 76 | 13 | 46 | 29 |
| Mario Jiménez | 0-2021 | 0 | 1 | .000 | 21.60 | 8 | 0 | 0 | 0 | 0 | 1.2 | 3 | 4 | 0 | 1 | 1 |
| Ji Jing | 0-2027 | 3 | 3 | .500 | 3.33 | 7 | 7 | 0 | 0 | 0 | 48.2 | 42 | 18 | 2 | 19 | 38 |
| Cole Johnson | 0-2021 | 4 | 5 | .444 | 4.55 | 19 | 19 | 1 | 0 | 0 | 110.2 | 127 | 56 | 7 | 49 | 69 |
| Joe Johnson | -1-2020 | 4 | 6 | .400 | 6.63 | 45 | 4 | 1 | 0 | 0 | 74.2 | 100 | 55 | 12 | 44 | 50 |
| Myron Johnson | 0-2020 | 2 | 8 | .200 | 7.68 | 14 | 10 | 0 | 0 | 0 | 68.0 | 93 | 58 | 10 | 38 | 32 |
| Denver Johnston | 0-2024 | 10 | 9 | .526 | 6.51 | 130 | 0 | 0 | 0 | 1 | 167.1 | 210 | 121 | 22 | 105 | 142 |
| Jim Johnstone | 0-2019 | 10 | 23 | .303 | 7.14 | 42 | 40 | 1 | 1 | 1 | 223.0 | 327 | 177 | 44 | 104 | 152 |
| Bryan Jones | 0-2026 | 2 | 2 | .500 | 6.75 | 41 | 0 | 0 | 0 | 1 | 26.2 | 37 | 20 | 1 | 18 | 22 |
| Gary Jones | 2-2027 | 9 | 7 | .562 | 3.94 | 82 | 7 | 1 | 0 | 11 | 164.1 | 186 | 72 | 12 | 59 | 91 |
| Harrison Jones | 0-2020 | 5 | 0 | 1.000 | 2.37 | 10 | 9 | 1 | 1 | 0 | 64.2 | 57 | 17 | 6 | 9 | 48 |
| Mike Jones | 0-2015 | 0 | 0 | .000 | 4.50 | 5 | 0 | 0 | 0 | 0 | 6.0 | 9 | 3 | 1 | 5 | 10 |
| Tom Jones | 0-2023 | 1 | 3 | .250 | 7.83 | 5 | 5 | 0 | 0 | 0 | 23.0 | 31 | 20 | 4 | 9 | 14 |
| Greg Jordan | 0-2025 | 0 | 0 | .000 | 1.93 | 3 | 0 | 0 | 0 | 0 | 4.2 | 3 | 1 | 0 | 1 | 6 |
| Mimosa Joseph | 0-2026 | 0 | 1 | .000 | 2.08 | 2 | 2 | 0 | 0 | 0 | 8.2 | 7 | 2 | 0 | 2 | 5 |
| José Juárez | 1-2025 | 8 | 12 | .400 | 5.00 | 24 | 23 | 6 | 1 | 0 | 160.1 | 153 | 89 | 14 | 70 | 114 |
