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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hayden Jackson | 2015-2015 | 2 | 0 | 1.000 | 5.64 | 31 | 0 | 0 | 0 | 2 | 30.1 | 35 | 19 | 3 | 23 | 21 |
| Romain Jacques | 2015-2015 | 2 | 0 | 1.000 | 6.41 | 36 | 0 | 0 | 0 | 1 | 39.1 | 42 | 28 | 6 | 43 | 50 |
| Brian James | 2017-2017 | 3 | 0 | 1.000 | 6.86 | 25 | 0 | 0 | 0 | 0 | 39.1 | 43 | 30 | 4 | 38 | 28 |
| Lionel Janin | 2013-2013 | 2 | 2 | .500 | 8.93 | 10 | 10 | 0 | 0 | 0 | 45.1 | 70 | 45 | 11 | 31 | 42 |
| Barry Jarville | 2017-2017 | 1 | 1 | .500 | 8.31 | 31 | 0 | 0 | 0 | 0 | 34.2 | 45 | 32 | 9 | 25 | 42 |
| Steven Jayne | 2012-2012 | 1 | 0 | 1.000 | 3.13 | 26 | 0 | 0 | 0 | 13 | 31.2 | 29 | 11 | 4 | 10 | 44 |
| Johnny Jean | 2013-2013 | 1 | 4 | .200 | 8.67 | 11 | 11 | 0 | 0 | 0 | 55.0 | 79 | 53 | 15 | 38 | 37 |
| Wade Jefferson | 2015-2015 | 0 | 2 | .000 | 7.97 | 37 | 0 | 0 | 0 | 1 | 35.0 | 41 | 31 | 6 | 26 | 29 |
| Greg Jeffery | 2014-2014 | 4 | 5 | .444 | 7.76 | 12 | 12 | 0 | 0 | 0 | 51.0 | 64 | 44 | 8 | 33 | 58 |
| Émeric Jegou | 2015-2015 | 0 | 1 | .000 | 3.56 | 28 | 0 | 0 | 0 | 19 | 30.1 | 25 | 12 | 3 | 23 | 32 |
| Ai-de Jen | 2018-2018 | 0 | 2 | .000 | 4.84 | 36 | 0 | 0 | 0 | 2 | 35.1 | 46 | 19 | 6 | 9 | 36 |
| Dan Jenkins | 2016-2016 | 1 | 9 | .100 | 9.76 | 14 | 13 | 0 | 0 | 0 | 55.1 | 83 | 60 | 18 | 35 | 51 |
| Xun Jiang | 2012-2012 | 1 | 4 | .200 | 5.70 | 31 | 0 | 0 | 0 | 2 | 36.1 | 42 | 23 | 7 | 23 | 34 |
| Juan Jiménez | 2018-2018 | 2 | 0 | 1.000 | 8.07 | 19 | 0 | 0 | 0 | 0 | 25.2 | 49 | 23 | 7 | 15 | 21 |
| Kennan Johannson | 2017-2017 | 5 | 2 | .714 | 3.27 | 11 | 11 | 0 | 0 | 0 | 66.0 | 59 | 24 | 3 | 23 | 68 |
| Jordan Johnstone | 2012-2012 | 6 | 3 | .667 | 2.91 | 13 | 13 | 1 | 0 | 0 | 80.1 | 73 | 26 | 5 | 29 | 81 |
| Adel Joly | 2016-2016 | 0 | 0 | .000 | 11.57 | 1 | 0 | 0 | 0 | 0 | 2.1 | 4 | 3 | 1 | 3 | 0 |
| Herb Juneau | 2012-2012 | 1 | 1 | .500 | 7.81 | 31 | 0 | 0 | 0 | 3 | 40.1 | 52 | 35 | 6 | 22 | 48 |
| Jay Juneau | 2012-2012 | 1 | 1 | .500 | 6.32 | 33 | 0 | 0 | 0 | 0 | 37.0 | 46 | 26 | 8 | 25 | 33 |
