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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 |
|---|---|---|---|---|---|---|---|---|---|
| Robert Jackson | 2009-2010 | .282 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Bartolo Jaimes | 2028-2039 | .141 | 0 | 7 | 29 | 26 | 28 | 3.01 | 328 |
| Geoff James | 2011-2011 | .231 | 0 | 0 | 2 | 2 | 0 | 3.69 | 15 |
| Gary Jansen | 2011-2014 | .113 | 0 | 3 | 12 | 17 | 0 | 5.02 | 156 |
| Willie Jeffries | 2010-2010 | .240 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Jiménez | 2039-2039 | .400 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Nolan Johnson | 2008-2008 | .400 | 0 | 2 | 3 | 4 | 0 | 6.47 | 49 |
| Jerry Jones | 2015-2015 | .125 | 1 | 3 | 5 | 5 | 0 | 3.50 | 44 |
| Yoshifumi Jouda | 2009-2009 | .143 | 0 | 1 | 3 | 4 | 0 | 6.65 | 37 |
| Yoshiteru Jouon | 2012-2012 | .000 | 0 | 0 | 0 | 2 | 1 | 1.88 | 11 |
| Anastasio Juárez | 2017-2017 | .400 | 0 | 0 | 2 | 3 | 1 | 4.75 | 33 |
| Juan Juárez | 2039-2039 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dani Júlio | 2034-2039 | .133 | 0 | 5 | 23 | 32 | 1 | 2.97 | 242 |
