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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Andrew Jamison | 2030-2030 | 2 | 2 | .500 | 4.85 | 17 | 0 | 0 | 0 | 0 | 39.0 | 42 | 21 | 7 | 9 | 45 |
| An Jang-Yop | 2023-2023 | 1 | 0 | 1.000 | 2.61 | 23 | 0 | 0 | 0 | 2 | 41.1 | 30 | 12 | 2 | 17 | 52 |
| Lex Janssen | 2034-2034 | 2 | 1 | .667 | 2.77 | 10 | 0 | 0 | 0 | 3 | 13.0 | 13 | 4 | 1 | 10 | 15 |
| Ángel Jaramillo | 2032-2032 | 4 | 0 | 1.000 | 2.16 | 22 | 0 | 0 | 0 | 1 | 33.1 | 38 | 8 | 5 | 18 | 34 |
| Miika Jarvi | 2034-2034 | 0 | 1 | .000 | 4.66 | 3 | 3 | 0 | 0 | 0 | 19.1 | 19 | 10 | 2 | 3 | 19 |
| Mike Jenson | 2028-2030 | 2 | 5 | .286 | 4.70 | 54 | 6 | 0 | 0 | 5 | 95.2 | 100 | 50 | 7 | 33 | 73 |
| John Jewell | 2030-2031 | 11 | 12 | .478 | 3.86 | 27 | 27 | 3 | 0 | 0 | 177.0 | 186 | 76 | 10 | 50 | 146 |
| António Jiménez | 2033-2034 | 7 | 11 | .389 | 6.13 | 50 | 13 | 1 | 0 | 2 | 152.2 | 189 | 104 | 15 | 69 | 125 |
| Esteban Jiménez | 2025-2025 | 2 | 1 | .667 | 0.77 | 33 | 0 | 0 | 0 | 16 | 35.0 | 19 | 3 | 2 | 13 | 34 |
| Miguel Jiménez | 2028-2029 | 10 | 8 | .556 | 2.37 | 28 | 17 | 0 | 0 | 0 | 133.0 | 102 | 35 | 5 | 38 | 128 |
| Miguel Jiménez | 2020-2020 | 1 | 3 | .250 | 3.55 | 23 | 0 | 0 | 0 | 8 | 25.1 | 24 | 10 | 0 | 16 | 24 |
| Ton Jobse | 2029-2029 | 1 | 2 | .333 | 7.63 | 3 | 3 | 0 | 0 | 0 | 15.1 | 24 | 13 | 0 | 4 | 21 |
| Franklin Johnson | 2025-2025 | 1 | 1 | .500 | 2.87 | 3 | 2 | 0 | 0 | 0 | 15.2 | 15 | 5 | 0 | 7 | 4 |
| Gary Johnson | 2033-2033 | 0 | 1 | .000 | 6.57 | 6 | 0 | 0 | 0 | 0 | 12.1 | 14 | 9 | 4 | 4 | 20 |
| Keith Johnson | 2031-2032 | 5 | 2 | .714 | 2.50 | 30 | 0 | 0 | 0 | 6 | 39.2 | 35 | 11 | 3 | 13 | 52 |
| Sam Johnston | 2034-2034 | 2 | 6 | .250 | 4.52 | 15 | 15 | 0 | 0 | 0 | 83.2 | 88 | 42 | 5 | 38 | 75 |
| Derek Jones | 2034-2034 | 6 | 8 | .429 | 4.28 | 20 | 20 | 3 | 1 | 0 | 143.0 | 153 | 68 | 5 | 42 | 107 |
| Leon Jones | 2020-2021 | 1 | 5 | .167 | 4.34 | 26 | 7 | 1 | 0 | 0 | 83.0 | 93 | 40 | 2 | 30 | 67 |
| Nate Jones | 2031-2031 | 2 | 6 | .250 | 5.75 | 21 | 12 | 1 | 0 | 0 | 83.0 | 101 | 53 | 11 | 36 | 63 |
| Steven Jones | 2021-2021 | 0 | 0 | .000 | 1.72 | 7 | 0 | 0 | 0 | 0 | 15.2 | 14 | 3 | 1 | 4 | 21 |
| Gojong Joseon | 2029-2029 | 5 | 2 | .714 | 1.88 | 41 | 0 | 0 | 0 | 24 | 43.0 | 27 | 9 | 0 | 15 | 62 |
| Jack Joyner | 2031-2031 | 3 | 1 | .750 | 1.87 | 21 | 7 | 0 | 0 | 3 | 77.0 | 59 | 16 | 2 | 28 | 79 |
| T.J. Juckson | 2034-2034 | 2 | 1 | .667 | 2.16 | 23 | 0 | 0 | 0 | 12 | 25.0 | 22 | 6 | 3 | 5 | 28 |
| Júlio Justiniano | 2034-2034 | 4 | 0 | 1.000 | 0.45 | 13 | 0 | 0 | 0 | 0 | 20.0 | 12 | 1 | 0 | 2 | 36 |
