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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Henning Jacobsen | 1913-1913 | .220 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Gobrías Jaime | 1905-1913 | .280 | 57 | 467 | 0 | 0 | 0 | 0.00 | 0 |
| Taylor James | 1912-1913 | .275 | 4 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Edmundo Jaramillo | 1901-1903 | .246 | 17 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Édgar Jaso | 1902-1910 | .301 | 62 | 527 | 0 | 0 | 0 | 0.00 | 0 |
| Benedicto Jaén | 1911-1911 | .270 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ross Jefferson | 1901-1902 | .000 | 0 | 0 | 6 | 4 | 1 | 4.38 | 39 |
| Ray Jeffery | 1905-1913 | .000 | 0 | 0 | 22 | 18 | 14 | 4.16 | 228 |
| Brendan Jenkins | 1912-1912 | .222 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Jerome | 1912-1913 | .000 | 0 | 0 | 7 | 9 | 2 | 3.87 | 129 |
| Adrián Jiménez | 1901-1905 | .000 | 0 | 0 | 74 | 46 | 1 | 3.28 | 390 |
| Ananías Jiménez | 1907-1913 | .000 | 0 | 0 | 30 | 24 | 63 | 2.33 | 304 |
| Esdras Jiménez | 1903-1911 | .278 | 60 | 398 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Jiménez | 1913-1913 | .000 | 0 | 0 | 1 | 1 | 2 | 0.46 | 20 |
| Rodrigo Jiménez | 1906-1913 | .242 | 24 | 180 | 0 | 0 | 0 | 0.00 | 0 |
| Rosario Jiménez | 1901-1902 | .284 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Rosario Jiménez | 1901-1912 | .000 | 0 | 0 | 47 | 45 | 3 | 3.62 | 441 |
| Tito Jiménez | 1906-1913 | .282 | 50 | 271 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jones | 1912-1912 | .110 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Heath Jones | 1901-1912 | .257 | 45 | 269 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Jones | 1912-1913 | .175 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel José | 1901-1913 | .285 | 53 | 473 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Juma | 1913-1913 | .000 | 0 | 0 | 1 | 0 | 0 | 3.38 | 14 |
| Willi Junker | 1913-1913 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 3 |
| Admeto Juárez | 1903-1913 | .257 | 37 | 187 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Juárez | 1906-1912 | .243 | 19 | 143 | 0 | 0 | 0 | 0.00 | 0 |
