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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bobby Jackson | 2037-2039 | 9 | 13 | .409 | 3.36 | 43 | 43 | 0 | 0 | 0 | 203.1 | 164 | 76 | 30 | 89 | 206 |
| Nick Jacobson | 2038-2038 | 1 | 1 | .500 | 5.71 | 6 | 2 | 0 | 0 | 1 | 17.1 | 15 | 11 | 4 | 11 | 17 |
| Declan Jamieson | 2034-2036 | 19 | 19 | .500 | 4.01 | 49 | 49 | 2 | 0 | 0 | 307.2 | 306 | 137 | 39 | 72 | 222 |
| Jaime Jaramillo | 2034-2034 | 1 | 2 | .333 | 3.32 | 4 | 4 | 0 | 0 | 0 | 19.0 | 14 | 7 | 4 | 5 | 19 |
| Juan Jaramillo | 2030-2031 | 10 | 8 | .556 | 2.56 | 41 | 21 | 2 | 0 | 16 | 151.1 | 128 | 43 | 5 | 41 | 142 |
| Taylor Jarrett | 2036-2036 | 6 | 0 | 1.000 | 3.28 | 8 | 8 | 0 | 0 | 0 | 49.1 | 38 | 18 | 8 | 17 | 61 |
| John Jenkins | 2030-2031 | 12 | 7 | .632 | 2.84 | 32 | 32 | 0 | 0 | 0 | 171.0 | 162 | 54 | 7 | 29 | 171 |
| Jeff Jennings | 2036-2037 | 4 | 6 | .400 | 8.73 | 48 | 0 | 0 | 0 | 1 | 66.0 | 89 | 64 | 25 | 36 | 64 |
| Zhi-fu Ji | 2032-2032 | 8 | 6 | .571 | 3.68 | 18 | 18 | 1 | 0 | 0 | 102.2 | 112 | 42 | 3 | 18 | 89 |
| Armando Jiménez | 2037-2039 | 7 | 5 | .583 | 4.58 | 28 | 15 | 0 | 0 | 8 | 94.1 | 94 | 48 | 18 | 46 | 74 |
| Félix Jiménez | 2033-2035 | 5 | 11 | .312 | 4.30 | 29 | 29 | 0 | 0 | 0 | 148.2 | 149 | 71 | 21 | 48 | 129 |
| Luis Jiménez | 2030-2031 | 19 | 6 | .760 | 2.55 | 31 | 31 | 0 | 0 | 0 | 197.1 | 158 | 56 | 9 | 41 | 152 |
| Pedro Jiménez | 2039-2039 | 4 | 9 | .308 | 11.55 | 65 | 1 | 0 | 0 | 1 | 74.0 | 119 | 95 | 28 | 61 | 53 |
| Dong-po Jiu | 2035-2035 | 0 | 0 | .000 | 2.11 | 9 | 0 | 0 | 0 | 0 | 21.1 | 28 | 5 | 1 | 4 | 17 |
| Jing-quo Jiu | 2032-2034 | 2 | 1 | .667 | 3.63 | 9 | 8 | 0 | 0 | 0 | 39.2 | 28 | 16 | 2 | 28 | 38 |
| Bei Joe | 2036-2036 | 3 | 3 | .500 | 3.54 | 34 | 0 | 0 | 0 | 19 | 40.2 | 34 | 16 | 6 | 19 | 63 |
| Gary Johnson | 2036-2036 | 3 | 2 | .600 | 4.48 | 15 | 15 | 0 | 0 | 0 | 68.1 | 61 | 34 | 13 | 42 | 53 |
| James Johnson | 2035-2037 | 6 | 3 | .667 | 3.80 | 57 | 4 | 0 | 0 | 5 | 104.1 | 94 | 44 | 11 | 52 | 93 |
| Michael Johnson | 2035-2037 | 9 | 7 | .562 | 4.66 | 40 | 26 | 0 | 0 | 0 | 146.2 | 118 | 76 | 23 | 70 | 175 |
| Jimmy Johnston | 2037-2037 | 4 | 3 | .571 | 3.46 | 34 | 0 | 0 | 0 | 19 | 39.0 | 22 | 15 | 6 | 24 | 53 |
| José Joje | 2032-2032 | 5 | 5 | .500 | 3.27 | 15 | 15 | 0 | 0 | 0 | 88.0 | 93 | 32 | 2 | 35 | 83 |
| Mal Jones | 2034-2035 | 4 | 13 | .235 | 5.17 | 29 | 29 | 0 | 0 | 0 | 130.2 | 152 | 75 | 18 | 45 | 97 |
| Lu-shan Joo | 2035-2035 | 5 | 1 | .833 | 5.67 | 24 | 1 | 0 | 0 | 1 | 46.0 | 49 | 29 | 12 | 23 | 63 |
| Isaac Jordan | 2034-2035 | 4 | 5 | .444 | 5.29 | 40 | 0 | 0 | 0 | 0 | 63.0 | 76 | 37 | 7 | 33 | 64 |
| Yi-mou Ju | 2038-2039 | 10 | 7 | .588 | 3.95 | 39 | 32 | 1 | 1 | 1 | 173.0 | 130 | 76 | 28 | 71 | 138 |
| Jing-quo Juan | 2033-2034 | 9 | 9 | .500 | 3.38 | 36 | 27 | 0 | 0 | 2 | 165.1 | 145 | 62 | 7 | 41 | 167 |
| Javier Juárez | 2031-2032 | 17 | 6 | .739 | 2.52 | 34 | 34 | 1 | 1 | 0 | 214.1 | 160 | 60 | 6 | 64 | 214 |
| Roberto Juárez | 2031-2032 | 5 | 11 | .312 | 5.21 | 25 | 18 | 0 | 0 | 0 | 96.2 | 134 | 56 | 5 | 37 | 50 |
| Vicente Juárez | 2034-2034 | 4 | 6 | .400 | 3.46 | 21 | 2 | 1 | 0 | 2 | 41.2 | 41 | 16 | 3 | 20 | 31 |
