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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 |
|---|---|---|---|---|---|---|---|---|---|
| Rich Uhlman | 2020-2020 | .000 | 0 | 0 | 2 | 6 | 0 | 3.78 | 58 |
| Josh Ulloa | 2021-2022 | .000 | 0 | 0 | 8 | 7 | 0 | 4.27 | 85 |
| Antonio Umana | 2024-2024 | .363 | 7 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Yellel Umar | 2024-2024 | .000 | 0 | 0 | 3 | 1 | 1 | 6.92 | 11 |
| Silvério Umbreiro | 2023-2023 | .000 | 0 | 0 | 1 | 1 | 0 | 3.49 | 28 |
| Shiro Umemoto | 2026-2026 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Underdahl | 2025-2025 | .216 | 11 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 2023-2025 | .000 | 0 | 0 | 3 | 2 | 3 | 4.50 | 26 |
| Mike Urbain | 2021-2021 | .000 | 0 | 0 | 0 | 2 | 0 | 1.69 | 11 |
| Joel Urban | 2025-2026 | .000 | 0 | 0 | 3 | 2 | 0 | 3.83 | 45 |
| Antonio Urbina | 2026-2026 | .000 | 0 | 0 | 3 | 4 | 0 | 4.50 | 49 |
| Fradique Urcullu | 2021-2022 | .000 | 0 | 0 | 3 | 2 | 2 | 2.70 | 105 |
| Edwin Urena | 2023-2025 | .000 | 0 | 0 | 7 | 5 | 2 | 5.38 | 68 |
| Jose Uriostegui | 2021-2025 | .000 | 0 | 0 | 2 | 1 | 0 | 3.83 | 31 |
| Mike Urquidi | 2025-2025 | .291 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Urquiola | 2024-2026 | .303 | 7 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Urquiola | 2016-2020 | .213 | 15 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Vinny Urrabazo | 2023-2026 | .271 | 21 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Tokio Ushijima | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 3 |
