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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rich Uhlman | 1-2023 | 5 | 11 | .313 | 3.59 | 39 | 31 | 0 | 0 | 0 | 170.2 | 154 | 68 | 8 | 70 | 158 |
| Josh Ulloa | 0-2026 | 1 | 4 | .200 | 2.85 | 42 | 0 | 0 | 0 | 2 | 41.0 | 34 | 13 | 2 | 12 | 40 |
| Silvério Umbreiro | -1-2024 | 12 | 7 | .632 | 4.64 | 168 | 5 | 0 | 0 | 28 | 244.1 | 239 | 126 | 28 | 100 | 196 |
| Dan Underwood | 0-2026 | 6 | 5 | .545 | 3.70 | 38 | 12 | 0 | 0 | 9 | 90.0 | 99 | 37 | 10 | 32 | 83 |
| Mike Urbain | 2-2025 | 8 | 10 | .444 | 2.52 | 70 | 22 | 0 | 0 | 17 | 178.1 | 132 | 50 | 7 | 84 | 178 |
| Antonio Urbina | 0-4 | 1 | 0 | 1.000 | 2.08 | 5 | 0 | 0 | 0 | 2 | 4.1 | 2 | 1 | 0 | 4 | 5 |
| Fradique Urcullu | 0-2024 | 9 | 4 | .692 | 1.52 | 20 | 17 | 0 | 0 | 0 | 100.2 | 80 | 17 | 3 | 37 | 84 |
| Edwin Urena | 0-6 | 0 | 1 | .000 | 8.53 | 5 | 0 | 0 | 0 | 0 | 6.1 | 11 | 6 | 0 | 7 | 3 |
| Jose Uriostegui | -1-2026 | 8 | 11 | .421 | 4.72 | 46 | 30 | 0 | 0 | 2 | 169.2 | 177 | 89 | 15 | 80 | 109 |
| Tokio Ushijima | 0-6 | 2 | 1 | .667 | 4.15 | 44 | 0 | 0 | 0 | 2 | 60.2 | 59 | 28 | 2 | 37 | 41 |
