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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 |
|---|---|---|---|---|---|---|---|---|---|
| John Jackson | 2036-2036 | .390 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Jacobson | 2036-2036 | .225 | 8 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Ryung Jae-Wook | 2033-2033 | .264 | 5 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Gil James | 2036-2036 | .219 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Jessie James | 2037-2037 | .286 | 0 | 1 | 0 | 1 | 0 | 3.68 | 6 |
| Rodger James | 2035-2036 | .333 | 0 | 1 | 8 | 8 | 1 | 5.28 | 111 |
| Dane Jane | 2035-2035 | .333 | 0 | 0 | 1 | 1 | 0 | 4.72 | 9 |
| Job Janssen | 2036-2036 | .000 | 0 | 0 | 1 | 0 | 0 | 3.68 | 10 |
| Lex Janssen | 2034-2035 | .000 | 0 | 0 | 12 | 5 | 1 | 3.50 | 173 |
| Stuart Janssen | 2032-2032 | .244 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Cornelio Japón | 2033-2034 | .263 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Japón | 2034-2036 | .286 | 6 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Neill Jasperse | 2035-2037 | .289 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Rashid Jeltkov | 2037-2037 | .216 | 2 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Jensson | 2033-2033 | .264 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Tak-wai Jia | 2033-2033 | .250 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 3.94 | 32 |
| Jesús Jiménez | 2037-2037 | .000 | 0 | 0 | 1 | 2 | 2 | 5.68 | 12 |
| Si-xun Jin | 2035-2037 | .295 | 34 | 157 | 0 | 0 | 0 | 0.00 | 0 |
| Ger Jobse | 2037-2037 | .267 | 5 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Kelly Johnson | 2036-2037 | .198 | 2 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Albert Johnston | 2033-2033 | .000 | 0 | 0 | 0 | 2 | 3 | 1.69 | 45 |
| Jacob Johnston | 2032-2032 | .000 | 0 | 0 | 0 | 3 | 1 | 5.55 | 49 |
| Nate Johnstone | 2033-2033 | .000 | 0 | 0 | 1 | 6 | 0 | 4.92 | 50 |
| Johnny Jones | 2036-2036 | .252 | 4 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Jones | 2037-2037 | .187 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Steffen Jones | 2033-2034 | .227 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Vaughan Jones | 2034-2034 | .000 | 0 | 0 | 1 | 0 | 10 | 3.10 | 28 |
| Reynold Jongenelen | 2037-2037 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Blair Jordan | 2035-2035 | .128 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jorgen Jorgenson | 2034-2035 | .236 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Josafat | 2033-2033 | .000 | 0 | 0 | 3 | 4 | 1 | 6.42 | 20 |
| Daniel Joseph | 2034-2034 | .263 | 5 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| John Joseph | 2037-2037 | .143 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Joseph | 2037-2037 | .214 | 0 | 5 | 0 | 0 | 0 | 21.00 | 3 |
| Jose Jovellanos | 2033-2033 | .000 | 0 | 0 | 1 | 0 | 0 | 2.16 | 20 |
| Ken Joyner | 2037-2037 | .306 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| John Juanda | 2035-2037 | .242 | 11 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Juderías | 2034-2034 | .291 | 0 | 28 | 0 | 0 | 0 | 0.00 | 0 |
