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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brian Jackson | 2059-2059 | 2 | 7 | .222 | 5.54 | 18 | 11 | 0 | 0 | 1 | 65.0 | 76 | 40 | 11 | 23 | 52 |
| Larry Jackson | 2056-2056 | 0 | 5 | .000 | 5.74 | 8 | 8 | 0 | 0 | 0 | 42.1 | 47 | 27 | 5 | 18 | 44 |
| Luther Jackson | 2059-2059 | 2 | 1 | .667 | 5.15 | 16 | 5 | 1 | 0 | 0 | 50.2 | 53 | 29 | 11 | 27 | 50 |
| Julien Jaffre | 2056-2057 | 3 | 1 | .750 | 5.09 | 13 | 0 | 0 | 0 | 0 | 23.0 | 27 | 13 | 5 | 7 | 23 |
| Sergej Jans | 2050-2051 | 1 | 1 | .500 | 2.66 | 11 | 0 | 0 | 0 | 0 | 23.2 | 20 | 7 | 3 | 11 | 32 |
| Nicol Janse | 2052-2053 | 1 | 3 | .250 | 5.66 | 16 | 5 | 0 | 0 | 0 | 47.2 | 55 | 30 | 9 | 14 | 48 |
| Bryan Jaramillo | 2059-2060 | 2 | 0 | 1.000 | 12.19 | 14 | 0 | 0 | 0 | 0 | 31.0 | 49 | 42 | 9 | 18 | 17 |
| Manuel Javier | 2055-2056 | 9 | 6 | .600 | 3.40 | 21 | 21 | 2 | 0 | 0 | 140.1 | 125 | 53 | 18 | 45 | 125 |
| Jack Jennings | 2058-2058 | 2 | 1 | .667 | 2.81 | 12 | 2 | 0 | 0 | 5 | 25.2 | 30 | 8 | 2 | 11 | 23 |
| Baltwin Jens | 2058-2059 | 0 | 12 | .000 | 8.62 | 21 | 16 | 0 | 0 | 0 | 78.1 | 110 | 75 | 20 | 34 | 53 |
| Nathan Jesty | 2059-2060 | 0 | 2 | .000 | 6.35 | 23 | 0 | 0 | 0 | 2 | 34.0 | 53 | 24 | 7 | 19 | 23 |
| Min Ji | 2052-2052 | 0 | 2 | .000 | 3.13 | 12 | 0 | 0 | 0 | 1 | 23.0 | 20 | 8 | 4 | 3 | 23 |
| Yu-eh Jiao | 2059-2060 | 2 | 0 | 1.000 | 4.23 | 18 | 3 | 0 | 0 | 4 | 38.1 | 51 | 18 | 3 | 23 | 26 |
| Carlos Jiménez | 2051-2052 | 5 | 1 | .833 | 2.03 | 27 | 6 | 1 | 1 | 7 | 84.1 | 61 | 19 | 7 | 24 | 90 |
| Pablo Jiménez | 2054-2055 | 2 | 3 | .400 | 2.48 | 11 | 7 | 0 | 0 | 4 | 40.0 | 38 | 11 | 3 | 13 | 47 |
| Richard Jiménez | 2053-2053 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.1 | 0 | 0 | 0 | 0 | 4 |
| Christiansen Johannsen | 2048-2048 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 1.1 | 2 | 0 | 0 | 0 | 0 |
| Benton Johnston | 2049-2049 | 2 | 1 | .667 | 2.20 | 7 | 1 | 0 | 0 | 1 | 16.1 | 12 | 4 | 0 | 9 | 15 |
| Sami Jokinen | 2058-2059 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Chris Jolland | 2054-2055 | 6 | 7 | .462 | 3.55 | 23 | 17 | 0 | 0 | 2 | 114.0 | 100 | 45 | 7 | 40 | 75 |
| Lewis Jones | 2060-2060 | 4 | 6 | .400 | 5.63 | 18 | 14 | 2 | 0 | 1 | 100.2 | 139 | 63 | 9 | 32 | 83 |
| David Jordan | 2052-2052 | 8 | 5 | .615 | 2.98 | 16 | 16 | 3 | 0 | 0 | 117.2 | 99 | 39 | 14 | 31 | 128 |
| Justin Joseph | 2059-2059 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 1 | 2 |
| Dong Ju | 2056-2056 | 0 | 0 | .000 | 1.59 | 2 | 0 | 0 | 0 | 0 | 5.2 | 5 | 1 | 1 | 2 | 5 |
| Eng-hee Juan | 2055-2055 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 |
| Tobias Juan | 2055-2057 | 7 | 4 | .636 | 3.02 | 31 | 1 | 0 | 0 | 10 | 56.2 | 51 | 19 | 10 | 19 | 66 |
| Logan Judkins | 2059-2060 | 0 | 1 | .000 | 6.21 | 14 | 1 | 0 | 0 | 0 | 37.2 | 36 | 26 | 7 | 41 | 21 |
| Alek Jukhman | 2056-2056 | 0 | 0 | .000 | 3.24 | 4 | 0 | 0 | 0 | 0 | 8.1 | 6 | 3 | 2 | 3 | 8 |
| Pierre-Jean Jung | 2053-2054 | 11 | 6 | .647 | 3.14 | 27 | 15 | 2 | 1 | 3 | 111.2 | 101 | 39 | 10 | 42 | 101 |
| Marvin Justice | 2053-2053 | 2 | 1 | .667 | 1.53 | 14 | 0 | 0 | 0 | 3 | 17.2 | 12 | 3 | 1 | 4 | 19 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| José Juárez | 2060-2060 | 5 | 2 | .714 | 2.68 | 9 | 9 | 0 | 0 | 0 | 53.2 | 67 | 16 | 6 | 21 | 44 |
| Visa Jänne | 2050-2050 | 7 | 3 | .700 | 3.84 | 16 | 16 | 0 | 0 | 0 | 98.1 | 101 | 42 | 12 | 30 | 69 |
