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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mike Uhlman | 2026-2026 | .185 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Rich Uhlman | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 4 |
| Josh Ulloa | 2020-2021 | .000 | 0 | 0 | 3 | 4 | 4 | 4.33 | 36 |
| Sung-jae Um | 2025-2026 | .000 | 0 | 0 | 3 | 1 | 4 | 5.75 | 33 |
| Antonio Umana | 2022-2023 | .254 | 4 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Yellel Umar | 2024-2026 | .000 | 0 | 0 | 0 | 2 | 1 | 7.20 | 7 |
| Silvério Umbreiro | 2022-2022 | .000 | 0 | 0 | 0 | 1 | 0 | 6.00 | 3 |
| Shiro Umemoto | 2024-2026 | .246 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Underdahl | 2023-2025 | .223 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 2022-2023 | .000 | 0 | 0 | 10 | 4 | 1 | 4.01 | 73 |
| Mike Urbain | 2019-2020 | .000 | 0 | 0 | 6 | 2 | 14 | 3.15 | 90 |
| Joel Urban | 2020-2026 | .000 | 0 | 0 | 12 | 8 | 13 | 3.13 | 111 |
| Mike Urbanek | 2026-2026 | .000 | 0 | 0 | 0 | 2 | 1 | 8.00 | 19 |
| Antonio Urbina | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 2 |
| Fradique Urcullu | 2019-2021 | .000 | 0 | 0 | 1 | 4 | 0 | 3.18 | 69 |
| Edwin Urena | 2023-2026 | .000 | 0 | 0 | 4 | 1 | 2 | 4.44 | 37 |
| Ron Uribe | 2021-2021 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Uriostegui | 2021-2024 | .000 | 0 | 0 | 8 | 4 | 2 | 3.41 | 83 |
| Mike Urquidi | 2021-2025 | .312 | 34 | 124 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Urquiola | 2021-2023 | .316 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Vinny Urrabazo | 2023-2025 | .318 | 14 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Urtiz | 2024-2026 | .302 | 9 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Tokio Ushijima | 2025-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 3.38 | 34 |
