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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Luke Jackson | -1-1 | 3 | 9 | .250 | 4.56 | 29 | 28 | 0 | 0 | 0 | 140.0 | 125 | 71 | 25 | 70 | 133 |
| Kenley Jansen | 1-1 | 6 | 8 | .429 | 2.60 | 103 | 0 | 0 | 0 | 58 | 104.0 | 82 | 30 | 11 | 37 | 146 |
| Jeremy Jeffress | 0-1 | 4 | 2 | .667 | 2.67 | 49 | 0 | 0 | 0 | 2 | 57.1 | 49 | 17 | 1 | 22 | 40 |
| Eddie Jenkins | 0-1 | 6 | 14 | .300 | 5.99 | 74 | 0 | 0 | 0 | 33 | 88.2 | 99 | 59 | 12 | 34 | 87 |
| Dan Jennings | 0-1 | 3 | 3 | .500 | 4.87 | 89 | 0 | 0 | 0 | 3 | 105.1 | 121 | 57 | 12 | 42 | 101 |
| Ubaldo Jimenez | 0-2 | 11 | 11 | .500 | 5.30 | 30 | 30 | 0 | 0 | 0 | 168.0 | 194 | 99 | 28 | 64 | 126 |
| Chris Johnson | 0-1 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.2 | 2 | 0 | 0 | 2 | 0 |
| Josh Johnson | 1-1 | 18 | 2 | .900 | 3.57 | 34 | 32 | 3 | 1 | 0 | 206.2 | 207 | 82 | 11 | 72 | 139 |
| Nate Jones | 1-1 | 7 | 6 | .538 | 2.98 | 119 | 0 | 0 | 0 | 4 | 121.0 | 114 | 40 | 8 | 51 | 119 |
| Zach Jones | 0-2 | 0 | 0 | .000 | 3.26 | 9 | 0 | 0 | 0 | 1 | 19.1 | 16 | 7 | 3 | 5 | 21 |
| Taylor Jungmann | 2-1 | 8 | 20 | .286 | 4.07 | 45 | 45 | 2 | 1 | 0 | 265.1 | 270 | 120 | 13 | 91 | 217 |
