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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arthur Jackson | 1981-1989 | 9 | 7 | .563 | 3.29 | 32 | 19 | 1 | 1 | 2 | 126.0 | 120 | 46 | 14 | 33 | 75 |
| Cal Jackson | 1927-1927 | 10 | 14 | .417 | 5.47 | 27 | 27 | 5 | 0 | 0 | 172.2 | 239 | 105 | 10 | 47 | 47 |
| Joey Jackson | 1961-1971 | 9 | 6 | .600 | 4.42 | 45 | 14 | 2 | 1 | 2 | 152.2 | 161 | 75 | 11 | 77 | 62 |
| Roy Jackson | 1988-1989 | 0 | 0 | .000 | 108.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 4 | 4 | 1 | 1 | 1 |
| Stu Jackson | 1932-1951 | 44 | 40 | .524 | 3.42 | 99 | 92 | 51 | 10 | 0 | 758.2 | 798 | 288 | 33 | 168 | 292 |
| Ellis Jarrom | 1930-1942 | 65 | 126 | .340 | 4.72 | 258 | 196 | 110 | 3 | 10 | 1671.0 | 1965 | 876 | 56 | 682 | 452 |
| Chris Jayne | 1945-1947 | 3 | 16 | .158 | 7.20 | 38 | 19 | 3 | 0 | 3 | 166.1 | 217 | 133 | 17 | 134 | 46 |
| Diego Jiménez | 1954-1965 | 0 | 1 | .000 | 4.50 | 17 | 0 | 0 | 0 | 0 | 22.0 | 30 | 11 | 1 | 9 | 15 |
| Pancho Jiménez | 1951-1951 | 1 | 5 | .167 | 5.07 | 11 | 5 | 1 | 0 | 0 | 49.2 | 57 | 28 | 11 | 22 | 29 |
| Yin-xiang Jin | 1981-1990 | 52 | 44 | .542 | 3.75 | 131 | 115 | 16 | 2 | 0 | 835.0 | 832 | 348 | 82 | 287 | 456 |
| Shawn Johnson | 1947-1952 | 2 | 2 | .500 | 5.47 | 23 | 1 | 0 | 0 | 2 | 49.1 | 50 | 30 | 5 | 26 | 11 |
| Bob Johnston | 1926-1937 | 137 | 151 | .476 | 4.01 | 327 | 313 | 192 | 15 | 4 | 2525.0 | 2748 | 1124 | 129 | 1010 | 1070 |
| Rod Johnston | 1965-1977 | 15 | 18 | .455 | 2.44 | 135 | 0 | 0 | 0 | 29 | 199.0 | 172 | 54 | 16 | 63 | 133 |
| Connor Johnstone | 1923-1931 | 28 | 31 | .475 | 3.98 | 177 | 28 | 6 | 1 | 16 | 470.2 | 550 | 208 | 33 | 154 | 116 |
| Brian Jollymour | 1914-1918 | 4 | 8 | .333 | 3.60 | 46 | 7 | 5 | 1 | 6 | 127.2 | 141 | 51 | 5 | 60 | 49 |
| Christian Joly | 1937-1942 | 65 | 63 | .508 | 4.08 | 134 | 134 | 102 | 7 | 0 | 1121.2 | 1239 | 509 | 95 | 398 | 238 |
| Wade Jonas | 1913-1913 | 4 | 5 | .444 | 4.67 | 9 | 9 | 9 | 0 | 0 | 81.0 | 82 | 42 | 6 | 37 | 28 |
| Arthur Jones | 1961-1966 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 2 | 0 |
| Ben Jones | 1980-1986 | 3 | 2 | .600 | 5.05 | 10 | 8 | 0 | 0 | 0 | 46.1 | 50 | 26 | 5 | 24 | 37 |
| Johnny Jones | 1929-1938 | 3 | 14 | .176 | 6.49 | 17 | 17 | 11 | 0 | 0 | 129.0 | 159 | 93 | 19 | 58 | 50 |
| George Jordan | 1984-1986 | 4 | 2 | .667 | 2.70 | 38 | 0 | 0 | 0 | 6 | 70.0 | 67 | 21 | 8 | 19 | 47 |
| Everett Joseph | 1919-1922 | 9 | 7 | .563 | 2.97 | 72 | 1 | 0 | 0 | 13 | 112.0 | 117 | 37 | 2 | 37 | 31 |
| Roger Jourdan | 1916-1922 | 28 | 29 | .491 | 3.49 | 96 | 67 | 29 | 3 | 2 | 559.1 | 571 | 217 | 18 | 156 | 90 |
| Scott Joyce | 1967-1969 | 14 | 15 | .483 | 4.07 | 41 | 33 | 3 | 1 | 1 | 221.0 | 207 | 100 | 29 | 92 | 162 |
| Uqessun Jumba | 1973-1981 | 40 | 50 | .444 | 4.31 | 139 | 121 | 10 | 3 | 0 | 818.1 | 878 | 392 | 58 | 300 | 332 |
| Neil Jupe | 1930-1931 | 1 | 9 | .100 | 5.77 | 36 | 0 | 0 | 0 | 7 | 53.0 | 85 | 34 | 1 | 20 | 12 |
