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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yokana Jaramogi | 1914-1914 | 1 | 1 | .500 | 5.01 | 16 | 3 | 1 | 0 | 0 | 59.1 | 74 | 33 | 3 | 25 | 22 |
| Propercio Jiménez | 1913-1913 | 2 | 0 | 1.000 | 3.52 | 6 | 1 | 1 | 0 | 3 | 15.1 | 11 | 6 | 1 | 3 | 11 |
| Ernest Johnson | 1901-1906 | 75 | 96 | .439 | 3.57 | 191 | 185 | 120 | 4 | 0 | 1524.0 | 1599 | 604 | 85 | 455 | 539 |
| Donncha Johnston | 1901-1906 | 8 | 8 | .500 | 4.40 | 82 | 10 | 5 | 0 | 1 | 243.2 | 289 | 119 | 23 | 73 | 74 |
| Christopher Johnstone | 1901-1913 | 18 | 15 | .545 | 4.29 | 184 | 0 | 0 | 0 | 11 | 356.2 | 360 | 170 | 49 | 123 | 212 |
| Bart Jones | 1901-1910 | 81 | 72 | .529 | 3.55 | 198 | 151 | 111 | 7 | 0 | 1381.1 | 1404 | 545 | 69 | 449 | 365 |
| Dowd Jones | 1901-1905 | 56 | 54 | .509 | 3.37 | 134 | 115 | 69 | 6 | 2 | 993.2 | 1036 | 372 | 53 | 259 | 307 |
| Gael Jones | 1914-1914 | 3 | 0 | 1.000 | 1.69 | 20 | 0 | 0 | 0 | 5 | 32.0 | 19 | 6 | 4 | 9 | 22 |
| Harvey Jones | 1901-1902 | 0 | 3 | .000 | 3.05 | 27 | 0 | 0 | 0 | 4 | 44.1 | 42 | 15 | 6 | 10 | 16 |
| Josh Jones | 1901-1914 | 221 | 191 | .536 | 3.54 | 490 | 443 | 212 | 20 | 3 | 3602.2 | 3608 | 1419 | 199 | 1131 | 1855 |
| Lyndon Jones | 1912-1914 | 20 | 32 | .385 | 5.04 | 62 | 59 | 26 | 1 | 0 | 421.2 | 553 | 236 | 40 | 109 | 160 |
| Thomas Jones | 1914-1914 | 0 | 0 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 1.1 | 1 | 1 | 0 | 0 | 0 |
| Shawn Jordan | 1901-1909 | 108 | 125 | .464 | 3.94 | 277 | 257 | 129 | 12 | 1 | 1998.1 | 1987 | 875 | 204 | 614 | 906 |
| Willi Junker | 1912-1912 | 0 | 1 | .000 | 5.68 | 6 | 0 | 0 | 0 | 0 | 19.0 | 24 | 12 | 2 | 5 | 12 |
| Pedro Jácquez | 1910-1912 | 24 | 35 | .407 | 3.43 | 90 | 73 | 26 | 6 | 0 | 642.2 | 660 | 245 | 39 | 151 | 441 |
