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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mazin Jabir | 2135-2135 | 1 | 0 | 1.000 | 0.00 | 1 | 1 | 0 | 0 | 0 | 6.0 | 2 | 0 | 0 | 1 | 6 |
| Danilo Jacinto | 2128-2129 | 0 | 0 | .000 | 4.32 | 2 | 1 | 0 | 0 | 0 | 8.1 | 7 | 4 | 0 | 3 | 7 |
| Moin Jadoon | 2143-2143 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 |
| Amjad Jahangiri | 2144-2144 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 2 |
| Daniel Jahnet | 2138-2153 | 0 | 1 | .000 | 3.07 | 4 | 2 | 0 | 0 | 0 | 14.2 | 12 | 5 | 1 | 2 | 14 |
| Nicolas Jamet | 2141-2141 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 3 |
| Dennis Jancke | 2150-2150 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 1 |
| Sohan Jayantilal | 2125-2133 | 3 | 1 | .750 | 2.49 | 12 | 1 | 0 | 0 | 2 | 21.2 | 13 | 6 | 3 | 5 | 35 |
| Antoine Jean | 2129-2130 | 1 | 0 | 1.000 | 0.00 | 3 | 1 | 0 | 0 | 0 | 9.1 | 4 | 0 | 0 | 2 | 8 |
| Sid Jennings | 2135-2137 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 1.2 | 1 | 0 | 0 | 0 | 0 |
| Richard Jewel | 2132-2132 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 1 | 3 |
| Qian-fu Jiang | 2140-2146 | 0 | 1 | .000 | 0.00 | 7 | 0 | 0 | 0 | 0 | 8.1 | 2 | 0 | 0 | 1 | 5 |
| Zheng-ze Jiang | 2125-2125 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 1 | 2.2 | 0 | 0 | 0 | 0 | 2 |
| Tony Jiménez | 2143-2143 | 0 | 0 | .000 | 5.40 | 1 | 0 | 0 | 0 | 0 | 1.2 | 3 | 1 | 0 | 2 | 3 |
| Pat Jones | 2147-2153 | 0 | 0 | .000 | 0.00 | 5 | 0 | 0 | 0 | 0 | 4.0 | 5 | 0 | 0 | 0 | 3 |
| Gabriel Juárez | 2151-2151 | 1 | 0 | 1.000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.1 | 2 | 0 | 0 | 0 | 1 |
