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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 | 2020-2026 | .000 | 0 | 0 | 5 | 11 | 0 | 3.59 | 158 |
| Josh Ulloa | 2022-2023 | .000 | 0 | 0 | 1 | 4 | 2 | 2.85 | 40 |
| Antonio Umana | 2024-2024 | .226 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Silvério Umbreiro | 2023-2026 | .000 | 0 | 0 | 12 | 7 | 28 | 4.64 | 196 |
| Dan Underwood | 2025-2026 | .000 | 0 | 0 | 6 | 5 | 9 | 3.70 | 83 |
| Mike Urbain | 2021-2025 | .000 | 0 | 0 | 8 | 10 | 17 | 2.52 | 178 |
| Antonio Urbina | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 2 | 2.08 | 5 |
| Fradique Urcullu | 2022-2023 | .000 | 0 | 0 | 9 | 4 | 0 | 1.52 | 84 |
| Edwin Urena | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 8.53 | 3 |
| Ron Uribe | 2019-2020 | .248 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Uriostegui | 2025-2026 | .000 | 0 | 0 | 8 | 11 | 2 | 4.72 | 109 |
| Mike Urquidi | 2025-2025 | .375 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Urquiola | 2025-2026 | .234 | 9 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Urquiola | 2019-2023 | .176 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Vinny Urrabazo | 2026-2026 | .225 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Tokio Ushijima | 2023-2023 | .000 | 0 | 0 | 2 | 1 | 2 | 4.15 | 41 |
