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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Enmanuel Ulloa | 1998-1998 | 4 | 0 | 1.000 | 0.88 | 19 | 0 | 0 | 0 | 7 | 41.0 | 21 | 4 | 1 | 1 | 61 |
| Jorge Ulloa | 2037-2040 | 3 | 3 | .500 | 8.14 | 19 | 4 | 0 | 0 | 0 | 48.2 | 50 | 44 | 14 | 40 | 72 |
| Pat Ulrey | 2036-2037 | 1 | 3 | .250 | 4.44 | 19 | 6 | 0 | 0 | 0 | 46.2 | 32 | 23 | 5 | 30 | 53 |
| Duane Underwood | 2012-2016 | 0 | 1 | .000 | 3.07 | 8 | 8 | 0 | 0 | 0 | 14.2 | 11 | 5 | 1 | 6 | 15 |
| Alfredo Unzue | 2012-2012 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 3.1 | 2 | 0 | 0 | 3 | 5 |
| Alfredo Urena | 2039-2040 | 8 | 1 | .889 | 3.64 | 48 | 0 | 0 | 0 | 4 | 111.1 | 86 | 45 | 16 | 62 | 174 |
| Sergio Urena | 2039-2040 | 4 | 5 | .444 | 5.92 | 12 | 2 | 0 | 0 | 0 | 59.1 | 65 | 39 | 9 | 32 | 82 |
| Benigno Uresti | 2036-2041 | 1 | 3 | .250 | 8.84 | 38 | 0 | 0 | 0 | 1 | 77.1 | 81 | 76 | 39 | 66 | 100 |
| Julio Urias | 2015-2018 | 0 | 0 | .000 | 1.42 | 4 | 4 | 0 | 0 | 0 | 6.1 | 4 | 1 | 0 | 1 | 11 |
| Humberto Uribe | 2039-2040 | 0 | 1 | .000 | 11.53 | 13 | 7 | 0 | 0 | 1 | 32.0 | 39 | 41 | 14 | 26 | 44 |
| Jorge Uribe | 2039-2040 | 0 | 0 | .000 | 10.57 | 4 | 0 | 0 | 0 | 0 | 7.2 | 12 | 9 | 2 | 8 | 3 |
| Juan Uribe | 2038-2041 | 4 | 1 | .800 | 8.36 | 21 | 1 | 0 | 0 | 0 | 42.0 | 47 | 39 | 15 | 36 | 63 |
| Juan Urrutia | 2031-2031 | 0 | 1 | .000 | 3.86 | 4 | 1 | 0 | 0 | 0 | 14.0 | 9 | 6 | 1 | 2 | 16 |
