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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Toimi Jaatinen | 2053-2055 | 5 | 10 | .333 | 4.75 | 49 | 20 | 0 | 0 | 0 | 165.0 | 171 | 87 | 20 | 55 | 119 |
| Afellan Jabulani | 2057-2058 | 0 | 1 | .000 | 6.12 | 30 | 0 | 0 | 0 | 0 | 57.1 | 75 | 39 | 8 | 22 | 29 |
| Rich Jacobs | 2043-2043 | 4 | 0 | 1.000 | 1.37 | 12 | 7 | 0 | 0 | 1 | 46.0 | 29 | 7 | 0 | 12 | 37 |
| Gabriel Jacques | 2046-2046 | 0 | 0 | .000 | 4.76 | 4 | 0 | 0 | 0 | 0 | 5.2 | 6 | 3 | 1 | 2 | 4 |
| Firdos Jam | 2049-2049 | 2 | 5 | .286 | 4.10 | 14 | 8 | 0 | 0 | 1 | 52.2 | 54 | 24 | 7 | 26 | 39 |
| Malik James | 2054-2054 | 1 | 1 | .500 | 4.41 | 3 | 3 | 0 | 0 | 0 | 16.1 | 19 | 8 | 0 | 4 | 14 |
| Tanner James | 2043-2043 | 3 | 2 | .600 | 4.05 | 6 | 5 | 1 | 0 | 0 | 33.1 | 35 | 15 | 6 | 18 | 28 |
| Buddy Janssen | 2045-2055 | 0 | 0 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 1.1 | 2 | 1 | 1 | 0 | 1 |
| Francisco Jaramillo | 2043-2043 | 2 | 0 | 1.000 | 6.23 | 2 | 2 | 0 | 0 | 0 | 13.0 | 17 | 9 | 2 | 0 | 13 |
| Ramón Jaramillo | 2047-2047 | 3 | 2 | .600 | 3.11 | 14 | 9 | 0 | 0 | 4 | 63.2 | 59 | 22 | 5 | 24 | 64 |
| Gerry Jarvis | 2043-2043 | 1 | 0 | 1.000 | 5.40 | 5 | 0 | 0 | 0 | 0 | 8.1 | 7 | 5 | 0 | 6 | 5 |
| Hanif Jat | 2057-2058 | 1 | 6 | .143 | 7.52 | 35 | 0 | 0 | 0 | 12 | 40.2 | 58 | 34 | 2 | 20 | 15 |
| Cooper Jensen | 2058-2058 | 2 | 2 | .500 | 5.05 | 16 | 1 | 0 | 0 | 0 | 41.0 | 36 | 23 | 4 | 20 | 38 |
| Mick Jervis | 2043-2043 | 2 | 1 | .667 | 6.11 | 12 | 0 | 0 | 0 | 1 | 17.2 | 21 | 12 | 3 | 7 | 15 |
| Dong-po Jiang | 2051-2055 | 6 | 4 | .600 | 2.82 | 70 | 0 | 0 | 0 | 17 | 95.2 | 84 | 30 | 7 | 36 | 101 |
| Firhun Jibade | 2054-2054 | 3 | 1 | .750 | 4.93 | 8 | 8 | 0 | 0 | 0 | 38.1 | 48 | 21 | 5 | 5 | 31 |
| Eisa Jibril | 2049-2052 | 16 | 19 | .457 | 4.37 | 48 | 47 | 4 | 3 | 0 | 249.0 | 250 | 121 | 27 | 63 | 272 |
| Octávio Jiménez | 2050-2052 | 10 | 5 | .667 | 4.82 | 69 | 4 | 0 | 0 | 1 | 173.2 | 172 | 93 | 18 | 95 | 186 |
| Kade Johnston | 2043-2043 | 2 | 4 | .333 | 9.42 | 11 | 11 | 0 | 0 | 0 | 43.0 | 64 | 45 | 2 | 27 | 28 |
| Luke Jones | 2043-2043 | 0 | 0 | .000 | 5.40 | 1 | 1 | 0 | 0 | 0 | 1.2 | 2 | 1 | 1 | 1 | 2 |
| Mick Joo | 2045-2046 | 5 | 8 | .385 | 7.83 | 16 | 15 | 0 | 0 | 0 | 69.0 | 94 | 60 | 16 | 30 | 46 |
| Jorge Jotta | 2051-2052 | 1 | 7 | .125 | 6.08 | 29 | 14 | 0 | 0 | 0 | 97.2 | 110 | 66 | 13 | 54 | 53 |
| Lyle Joule | 2055-2055 | 0 | 3 | .000 | 6.38 | 5 | 5 | 0 | 0 | 0 | 24.0 | 26 | 17 | 2 | 13 | 11 |
| Radoje Jovic | 2044-2045 | 5 | 4 | .556 | 4.29 | 33 | 0 | 0 | 0 | 1 | 56.2 | 52 | 27 | 10 | 30 | 63 |
| Alfredo Juárez | 2043-2043 | 2 | 2 | .500 | 6.12 | 7 | 7 | 0 | 0 | 0 | 32.1 | 38 | 22 | 3 | 15 | 38 |
