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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Andre Jackson | 2022-2022 | 1 | 1 | .500 | 4.09 | 9 | 0 | 0 | 0 | 0 | 11.0 | 11 | 5 | 0 | 3 | 8 |
| Edwin Jackson | 2004-2019 | 59 | 77 | .434 | 4.80 | 335 | 160 | 4 | 2 | 3 | 1164.1 | 1263 | 621 | 142 | 440 | 1082 |
| Jay Jackson | 2010-2024 | 27 | 15 | .643 | 4.84 | 142 | 50 | 2 | 1 | 0 | 392.1 | 397 | 211 | 39 | 163 | 360 |
| Zach Jackson | 2022-2024 | 3 | 3 | .500 | 3.80 | 62 | 0 | 0 | 0 | 1 | 68.2 | 55 | 29 | 5 | 25 | 72 |
| Alek Jacob | 2023-2024 | 0 | 0 | .000 | 2.04 | 10 | 0 | 0 | 0 | 0 | 17.2 | 9 | 4 | 1 | 3 | 24 |
| David Jagoditsh | 2012-2012 | 3 | 2 | .600 | 2.10 | 8 | 8 | 0 | 0 | 0 | 55.2 | 44 | 13 | 2 | 15 | 29 |
| Josh James | 2015-2022 | 15 | 17 | .469 | 4.96 | 136 | 32 | 1 | 1 | 0 | 293.2 | 260 | 162 | 45 | 147 | 334 |
| Drey Jameson | 2023-2023 | 0 | 0 | .000 | 3.00 | 3 | 0 | 0 | 0 | 0 | 3.0 | 1 | 1 | 0 | 3 | 0 |
| Kenley Jansen | 2012-2025 | 52 | 58 | .473 | 2.90 | 870 | 1 | 0 | 0 | 334 | 923.1 | 702 | 298 | 83 | 319 | 1179 |
| Casey Janssen | 2007-2016 | 43 | 23 | .652 | 3.17 | 448 | 18 | 1 | 0 | 14 | 599.0 | 529 | 211 | 60 | 169 | 557 |
| Jake Jarvis | 2015-2015 | 7 | 3 | .700 | 3.16 | 13 | 13 | 0 | 0 | 0 | 99.2 | 85 | 35 | 4 | 55 | 84 |
| Justin Jarvis | 2024-2024 | 1 | 2 | .333 | 6.84 | 25 | 0 | 0 | 0 | 0 | 26.1 | 32 | 20 | 10 | 10 | 25 |
| Cristian Javier | 2022-2025 | 15 | 16 | .484 | 4.70 | 74 | 44 | 0 | 0 | 0 | 252.2 | 214 | 132 | 40 | 98 | 271 |
| Griffin Jax | 2021-2024 | 3 | 3 | .500 | 3.30 | 103 | 4 | 0 | 0 | 1 | 131.0 | 125 | 48 | 13 | 40 | 99 |
| Jon Jay | 2010-2021 | 0 | 0 | .000 | 18.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 2 | 0 | 2 | 0 |
| Daulton Jefferies | 2022-2024 | 12 | 17 | .414 | 5.26 | 37 | 30 | 0 | 0 | 0 | 200.0 | 216 | 117 | 41 | 34 | 141 |
| Michael Jefferson | 2012-2012 | 5 | 3 | .625 | 1.43 | 11 | 11 | 3 | 2 | 0 | 88.1 | 64 | 14 | 0 | 11 | 44 |
| Jeremy Jeffress | 2010-2020 | 27 | 20 | .574 | 3.26 | 390 | 3 | 0 | 0 | 14 | 515.2 | 440 | 187 | 41 | 240 | 549 |
| Chad Jenkins | 2010-2014 | 14 | 33 | .298 | 4.86 | 79 | 54 | 4 | 1 | 1 | 318.1 | 353 | 172 | 29 | 115 | 220 |
| Tyrell Jenkins | 2016-2017 | 1 | 3 | .250 | 9.33 | 7 | 4 | 0 | 0 | 0 | 27.0 | 41 | 28 | 6 | 11 | 19 |
| Dan Jennings | 2010-2020 | 19 | 13 | .594 | 4.09 | 358 | 0 | 0 | 0 | 14 | 337.0 | 303 | 153 | 27 | 164 | 340 |
| Chris Jensen | 2012-2012 | 3 | 1 | .750 | 0.51 | 8 | 3 | 0 | 0 | 0 | 35.1 | 19 | 2 | 0 | 2 | 20 |
| Dan Jensen | 2012-2012 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 1 | 2 |
| Michael Jensen | 2012-2012 | 0 | 3 | .000 | 6.00 | 3 | 3 | 0 | 0 | 0 | 18.0 | 20 | 12 | 1 | 9 | 9 |
| Kevin Jepsen | 2010-2016 | 9 | 7 | .562 | 3.67 | 175 | 0 | 0 | 0 | 12 | 221.0 | 189 | 90 | 17 | 100 | 253 |
| Williams Jerez | 2012-2016 | 1 | 2 | .333 | 4.48 | 63 | 0 | 0 | 0 | 1 | 70.1 | 70 | 35 | 10 | 18 | 67 |
| Jake Jewell | 2015-2015 | 3 | 5 | .375 | 5.82 | 16 | 12 | 0 | 0 | 0 | 85.0 | 85 | 55 | 11 | 72 | 77 |
| Joe Jimenez | 2018-2025 | 19 | 15 | .559 | 4.00 | 348 | 0 | 0 | 0 | 32 | 344.1 | 281 | 153 | 59 | 113 | 431 |
| Ubaldo Jimenez | 2010-2020 | 96 | 66 | .593 | 4.12 | 239 | 209 | 3 | 0 | 0 | 1308.2 | 1262 | 599 | 110 | 603 | 1306 |
| Cole Johnson | 2012-2012 | 3 | 0 | 1.000 | 2.41 | 16 | 0 | 0 | 0 | 0 | 18.2 | 9 | 5 | 1 | 7 | 16 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Erik Johnson | 2012-2017 | 0 | 0 | .000 | 5.40 | 4 | 0 | 0 | 0 | 3 | 3.1 | 4 | 2 | 0 | 2 | 2 |
| Jacob Johnson | 2010-2011 | 8 | 13 | .381 | 2.55 | 37 | 37 | 2 | 0 | 0 | 239.2 | 214 | 68 | 13 | 86 | 178 |
| Jim Johnson | 2008-2018 | 21 | 16 | .568 | 3.70 | 335 | 5 | 0 | 0 | 21 | 394.0 | 430 | 162 | 29 | 115 | 363 |
| Josh M. Johnson | 2006-2017 | 160 | 95 | .627 | 3.65 | 370 | 361 | 11 | 2 | 0 | 2305.2 | 2204 | 936 | 186 | 801 | 2099 |
| Patrick Johnson | 2012-2012 | 3 | 5 | .375 | 2.75 | 10 | 10 | 2 | 1 | 0 | 72.0 | 53 | 22 | 1 | 12 | 68 |
| Pierce Johnson | 2016-2025 | 13 | 14 | .481 | 4.00 | 240 | 5 | 0 | 0 | 23 | 247.1 | 216 | 110 | 44 | 115 | 286 |
| Seth Johnson | 2024-2024 | 0 | 1 | .000 | 3.96 | 16 | 11 | 0 | 0 | 0 | 63.2 | 66 | 28 | 12 | 24 | 57 |
| Steven Johnson | 2010-2014 | 12 | 11 | .522 | 4.06 | 56 | 42 | 0 | 0 | 0 | 270.1 | 250 | 122 | 24 | 127 | 247 |
| Eric Jokisch | 2018-2018 | 0 | 0 | .000 | 4.09 | 4 | 0 | 0 | 0 | 0 | 11.0 | 13 | 5 | 1 | 6 | 8 |
| Chris Jones | 2010-2012 | 13 | 3 | .812 | 2.40 | 24 | 22 | 0 | 0 | 0 | 146.1 | 96 | 39 | 5 | 52 | 149 |
| Connor W. Jones | 2020-2020 | 0 | 0 | .000 | 4.00 | 9 | 0 | 0 | 0 | 0 | 9.0 | 11 | 4 | 0 | 5 | 9 |
| Devin Jones | 2012-2012 | 2 | 3 | .400 | 2.29 | 17 | 9 | 0 | 0 | 0 | 78.2 | 52 | 20 | 3 | 15 | 56 |
| Jared Jones | 2024-2025 | 10 | 6 | .625 | 5.51 | 36 | 24 | 0 | 0 | 2 | 142.0 | 149 | 87 | 20 | 53 | 137 |
| Nate Jones | 2010-2021 | 24 | 19 | .558 | 3.20 | 357 | 0 | 0 | 0 | 38 | 413.1 | 364 | 147 | 64 | 133 | 510 |
| Tyler Jones | 2010-2012 | 1 | 4 | .200 | 4.25 | 8 | 4 | 0 | 0 | 0 | 29.2 | 27 | 14 | 3 | 6 | 21 |
| Taylor Jordan | 2010-2016 | 24 | 41 | .369 | 4.96 | 91 | 91 | 4 | 2 | 0 | 507.2 | 590 | 280 | 46 | 157 | 317 |
| Felix Jorge | 2012-2020 | 4 | 7 | .364 | 5.18 | 45 | 14 | 0 | 0 | 1 | 114.2 | 131 | 66 | 16 | 33 | 77 |
| Caleb Joseph | 2010-2018 | 0 | 1 | .000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 3 | 3 | 2 | 1 | 0 |
| Ben Joyce | 2025-2025 | 4 | 3 | .571 | 3.75 | 70 | 0 | 0 | 0 | 2 | 72.0 | 53 | 30 | 7 | 32 | 71 |
| Su-Min Jung | 2012-2012 | 5 | 0 | 1.000 | 0.95 | 6 | 6 | 0 | 0 | 0 | 47.1 | 30 | 5 | 0 | 4 | 34 |
| Taylor Jungmann | 2012-2012 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 3.0 | 2 | 0 | 0 | 1 | 3 |
| Jakob Junis | 2012-2025 | 20 | 37 | .351 | 5.44 | 207 | 74 | 2 | 1 | 1 | 549.0 | 597 | 332 | 103 | 145 | 467 |
| Ariel Jurado | 2019-2021 | 2 | 6 | .250 | 7.52 | 20 | 15 | 0 | 0 | 0 | 87.1 | 134 | 73 | 19 | 24 | 30 |
| Jair Jurrjens | 2008-2017 | 43 | 41 | .512 | 4.74 | 150 | 120 | 2 | 2 | 0 | 761.0 | 788 | 401 | 83 | 323 | 574 |
