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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Norio Uchiyama | 2048-2051 | 5 | 5 | .500 | 6.18 | 37 | 7 | 0 | 0 | 1 | 102.0 | 122 | 70 | 43 | 13 | 108 |
| Hallinan Udny | 2015-2018 | 16 | 8 | .667 | 3.75 | 57 | 46 | 0 | 0 | 0 | 281.0 | 269 | 117 | 22 | 83 | 296 |
| Denie Ulderink | 2036-2036 | 1 | 0 | 1.000 | 3.97 | 10 | 0 | 0 | 0 | 6 | 11.1 | 7 | 5 | 0 | 6 | 18 |
| Leoncio Ulibarri | 2026-2028 | 8 | 10 | .444 | 4.37 | 31 | 26 | 3 | 1 | 0 | 181.1 | 192 | 88 | 10 | 93 | 112 |
| Glenn Underwood | 2040-2041 | 5 | 21 | .192 | 5.02 | 47 | 47 | 0 | 0 | 0 | 229.1 | 253 | 128 | 27 | 84 | 142 |
| António Uribe | 2022-2022 | 7 | 3 | .700 | 3.47 | 19 | 19 | 0 | 0 | 0 | 119.1 | 86 | 46 | 4 | 60 | 147 |
| Ignacio Uribe | 2034-2035 | 1 | 0 | 1.000 | 1.23 | 2 | 2 | 1 | 0 | 0 | 14.2 | 7 | 2 | 1 | 4 | 6 |
