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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nick Jacobs | 2060-2060 | 7 | 1 | .875 | 2.63 | 16 | 16 | 0 | 0 | 0 | 102.2 | 92 | 30 | 9 | 21 | 97 |
| Archie Jacobson | 2051-2052 | 1 | 1 | .500 | 3.12 | 11 | 0 | 0 | 0 | 1 | 26.0 | 23 | 9 | 3 | 4 | 37 |
| Raymond James | 2060-2060 | 1 | 0 | 1.000 | 1.83 | 11 | 0 | 0 | 0 | 0 | 19.2 | 15 | 4 | 1 | 7 | 11 |
| Eric Jenkins | 2053-2053 | 4 | 4 | .500 | 2.34 | 14 | 14 | 0 | 0 | 0 | 77.0 | 80 | 20 | 6 | 17 | 78 |
| Min Ji | 2053-2054 | 3 | 1 | .750 | 3.11 | 23 | 0 | 0 | 0 | 5 | 46.1 | 39 | 16 | 7 | 14 | 50 |
| Wang-fen Jia | 2053-2054 | 9 | 7 | .562 | 2.69 | 21 | 21 | 0 | 0 | 0 | 130.1 | 111 | 39 | 9 | 24 | 122 |
| Wu-shiun Jia | 2055-2056 | 2 | 1 | .667 | 2.37 | 25 | 0 | 0 | 0 | 1 | 38.0 | 33 | 10 | 2 | 15 | 37 |
| Wei-sng Jiang | 2058-2058 | 3 | 1 | .750 | 4.76 | 8 | 0 | 0 | 0 | 0 | 17.0 | 13 | 9 | 4 | 15 | 16 |
| Carlos Jiménez | 2051-2052 | 1 | 0 | 1.000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 6.0 | 3 | 0 | 0 | 3 | 6 |
| Pablo Jiménez | 2053-2053 | 5 | 4 | .556 | 2.81 | 15 | 15 | 0 | 0 | 0 | 93.0 | 77 | 29 | 11 | 27 | 100 |
| Christiansen Johannsen | 2049-2050 | 1 | 2 | .333 | 5.91 | 35 | 0 | 0 | 0 | 2 | 45.2 | 55 | 30 | 11 | 20 | 45 |
| Bobby Johnson | 2059-2059 | 1 | 0 | 1.000 | 0.00 | 3 | 1 | 0 | 0 | 0 | 11.1 | 9 | 0 | 0 | 0 | 9 |
| Marvin Johnson | 2060-2060 | 1 | 0 | 1.000 | 1.08 | 2 | 2 | 0 | 0 | 0 | 16.2 | 10 | 2 | 2 | 3 | 16 |
| Mike Jolly | 2056-2056 | 1 | 1 | .500 | 4.60 | 14 | 0 | 0 | 0 | 3 | 31.1 | 30 | 16 | 6 | 11 | 17 |
| Vincent Jones | 2060-2060 | 0 | 1 | .000 | 5.65 | 5 | 0 | 0 | 0 | 0 | 14.1 | 15 | 9 | 2 | 4 | 10 |
| John Joseph | 2061-2061 | 1 | 1 | .500 | 5.23 | 2 | 2 | 0 | 0 | 0 | 10.1 | 11 | 6 | 3 | 3 | 10 |
| Eiichi Jouda | 2054-2054 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 2.2 | 2 | 0 | 0 | 1 | 3 |
| Chua chay Juan | 2050-2050 | 0 | 0 | .000 | 3.86 | 3 | 0 | 0 | 0 | 1 | 9.1 | 10 | 4 | 1 | 4 | 7 |
| Eng-hee Juan | 2054-2054 | 2 | 2 | .500 | 3.21 | 23 | 7 | 0 | 0 | 1 | 53.1 | 54 | 19 | 8 | 15 | 64 |
| Pierre-Jean Jung | 2052-2052 | 5 | 2 | .714 | 1.58 | 20 | 8 | 0 | 0 | 6 | 62.2 | 53 | 11 | 6 | 13 | 47 |
| Visa Jänne | 2051-2052 | 3 | 6 | .333 | 3.61 | 21 | 16 | 0 | 0 | 1 | 109.2 | 105 | 44 | 11 | 39 | 98 |
