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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alistair Jacks | 1988-1990 | 13 | 11 | .542 | 3.57 | 39 | 39 | 1 | 0 | 0 | 265.0 | 247 | 105 | 16 | 60 | 132 |
| Cal Jackson | 1929-1930 | 13 | 4 | .765 | 4.51 | 61 | 0 | 0 | 0 | 8 | 109.2 | 133 | 55 | 10 | 21 | 37 |
| Harry Jackson | 1979-1987 | 9 | 13 | .409 | 4.18 | 93 | 13 | 1 | 1 | 25 | 174.1 | 177 | 81 | 3 | 105 | 74 |
| Samuel Jackson | 1960-1965 | 33 | 31 | .516 | 3.48 | 89 | 89 | 5 | 2 | 0 | 569.0 | 523 | 220 | 53 | 191 | 458 |
| Stan Jackson | 1960-1965 | 24 | 23 | .511 | 2.92 | 87 | 60 | 18 | 3 | 8 | 466.0 | 415 | 151 | 48 | 121 | 261 |
| Teppo Jallinoja | 1972-1972 | 5 | 8 | .385 | 4.64 | 28 | 2 | 1 | 0 | 4 | 52.1 | 64 | 27 | 9 | 19 | 31 |
| Geiler Janz | 1940-1940 | 0 | 0 | .000 | 11.57 | 1 | 0 | 0 | 0 | 0 | 2.1 | 4 | 3 | 0 | 3 | 2 |
| Jammu Jarvilehto | 1987-1987 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 0 | 0 | 0 | 0 | 1 |
| Chris Jennings | 1959-1965 | 20 | 20 | .500 | 3.98 | 97 | 32 | 8 | 0 | 9 | 325.1 | 338 | 144 | 46 | 105 | 222 |
| Tynan Jennings | 1939-1939 | 0 | 0 | .000 | 2.25 | 5 | 0 | 0 | 0 | 0 | 4.0 | 3 | 1 | 0 | 2 | 2 |
| Alex Jensen | 1936-1936 | 0 | 0 | .000 | 3.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 2 | 1 | 0 | 4 | 1 |
| Sandro Jiménez | 1968-1973 | 7 | 12 | .368 | 4.33 | 39 | 23 | 3 | 2 | 0 | 172.2 | 186 | 83 | 22 | 73 | 94 |
| Max Johns | 1989-1990 | 1 | 5 | .167 | 7.36 | 28 | 5 | 0 | 0 | 2 | 55.0 | 65 | 45 | 6 | 39 | 32 |
| Andy Johnson | 1960-1962 | 21 | 14 | .600 | 3.44 | 42 | 42 | 11 | 1 | 0 | 306.1 | 267 | 117 | 32 | 151 | 297 |
| Blake Johnson | 1967-1974 | 10 | 13 | .435 | 3.56 | 81 | 17 | 2 | 1 | 7 | 230.1 | 214 | 91 | 23 | 87 | 158 |
| Kim Johnsson | 1962-1973 | 21 | 15 | .583 | 3.16 | 75 | 55 | 1 | 0 | 1 | 335.2 | 277 | 118 | 17 | 155 | 270 |
| Paul Johnston | 1959-1966 | 6 | 7 | .462 | 3.66 | 95 | 6 | 2 | 1 | 5 | 187.0 | 190 | 76 | 22 | 62 | 117 |
| Kenny Johnstone | 1972-1972 | 3 | 7 | .300 | 3.84 | 13 | 13 | 3 | 1 | 0 | 84.1 | 85 | 36 | 8 | 36 | 34 |
| Jeffrey Jones | 1968-1977 | 8 | 10 | .444 | 3.69 | 109 | 1 | 0 | 0 | 20 | 187.2 | 161 | 77 | 23 | 95 | 166 |
| Max Jones | 1949-1961 | 75 | 87 | .463 | 3.94 | 178 | 178 | 103 | 13 | 0 | 1442.2 | 1380 | 631 | 162 | 558 | 903 |
| Wade Jones | 1988-1990 | 4 | 3 | .571 | 3.48 | 41 | 6 | 0 | 0 | 13 | 64.2 | 55 | 25 | 6 | 32 | 35 |
| David Juárez | 1947-1947 | 0 | 0 | .000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 5 | 2 | 0 | 1 | 1 |
| Armando Júlio | 1987-1987 | 2 | 0 | 1.000 | 3.52 | 15 | 0 | 0 | 0 | 0 | 23.0 | 20 | 9 | 2 | 9 | 23 |
| Neil Jupe | 1932-1939 | 23 | 23 | .500 | 4.32 | 147 | 13 | 0 | 0 | 31 | 333.1 | 381 | 160 | 11 | 110 | 99 |
