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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Floyd Jackson | 2016-2016 | .000 | 0 | 0 | 0 | 5 | 0 | 6.39 | 13 |
| Bernie Jacoby | 2021-2021 | .000 | 0 | 0 | 4 | 11 | 0 | 3.94 | 73 |
| Juan Jaimes | 2035-2038 | .188 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Geoff James | 2012-2012 | .000 | 0 | 0 | 2 | 0 | 0 | 4.05 | 8 |
| Carlos Jaramillo | 2038-2038 | .000 | 0 | 0 | 0 | 3 | 0 | 7.85 | 19 |
| César Jiménez | 2029-2039 | .253 | 65 | 254 | 0 | 0 | 0 | 0.00 | 0 |
| Enrico Jiménez | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 0 | 5.06 | 2 |
| Jamie Johnston | 2019-2019 | .000 | 0 | 0 | 4 | 4 | 0 | 6.26 | 38 |
| Ken Johnstone | 2012-2012 | .000 | 0 | 0 | 4 | 5 | 3 | 4.97 | 41 |
| Guillermo Juarhe | 2028-2039 | .000 | 0 | 0 | 30 | 27 | 12 | 3.58 | 507 |
| Anastasio Juárez | 2017-2017 | .000 | 0 | 0 | 3 | 4 | 0 | 4.85 | 34 |
| Cisco Juárez | 2038-2039 | .270 | 3 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| César Juárez | 2015-2016 | .297 | 37 | 143 | 0 | 0 | 0 | 0.00 | 0 |
