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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 | 2017-2023 | .000 | 0 | 0 | 17 | 28 | 7 | 4.41 | 343 |
| Josh Ulloa | 2023-2026 | .000 | 0 | 0 | 11 | 10 | 4 | 3.99 | 264 |
| Antonio Umana | 2024-2025 | .269 | 14 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Silvério Umbreiro | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 1 |
| Dan Underwood | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 4.11 | 54 |
| Butch Upchurch | 2024-2026 | .000 | 0 | 0 | 5 | 5 | 0 | 3.84 | 146 |
| Mike Urbain | 2023-2025 | .000 | 0 | 0 | 9 | 4 | 2 | 3.24 | 204 |
| Fradique Urcullu | 2023-2024 | .000 | 0 | 0 | 11 | 8 | 0 | 3.24 | 165 |
| Ron Uribe | 2018-2020 | .240 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Uriostegui | 2026-2026 | .000 | 0 | 0 | 0 | 1 | 0 | 4.91 | 2 |
| Mike Urquidi | 2025-2025 | .306 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Urquiola | 2025-2026 | .213 | 0 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Urquiola | 2020-2026 | .206 | 10 | 36 | 0 | 0 | 0 | 0.00 | 0 |
