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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 |
|---|---|---|---|---|---|---|---|---|---|
| Diederick Ubbens | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 15.43 | 4 |
| Shamil Ubiera | 2015-2017 | .252 | 6 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Uccello | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Elys Ugueto | 2016-2020 | .244 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Uhen | 2015-2022 | .000 | 0 | 0 | 8 | 24 | 0 | 4.43 | 229 |
| José Ulabarro | 2021-2026 | .268 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Gene Umbleby | 2030-2031 | .000 | 0 | 0 | 8 | 12 | 3 | 6.41 | 232 |
| Norm Underwood | 2026-2026 | .000 | 0 | 0 | 3 | 3 | 9 | 2.36 | 91 |
| Max Ungar | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Urbanski | 2019-2019 | .000 | 0 | 0 | 1 | 5 | 1 | 4.91 | 54 |
| Luis Urbina | 2025-2026 | .000 | 0 | 0 | 5 | 12 | 0 | 5.85 | 65 |
| Raúl Urbina | 2020-2020 | .292 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Ugueth Urbina Jr. | 2015-2017 | .000 | 0 | 0 | 30 | 19 | 0 | 3.69 | 389 |
| Miguel Urena | 2017-2017 | .000 | 0 | 0 | 2 | 1 | 1 | 2.37 | 18 |
| Richard Urena | 2015-2015 | .319 | 0 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Rigobert Urena | 2019-2019 | .000 | 0 | 0 | 12 | 8 | 0 | 3.48 | 131 |
| Luis Urias | 2015-2018 | .221 | 6 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Chad Uribe | 2030-2030 | .248 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| José Uribe | 2029-2029 | .290 | 11 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Juliano Uribe | 2029-2031 | .251 | 16 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Melchor Urquides | 2015-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 1.42 | 7 |
| Sergio Usquiano | 2026-2029 | .199 | 7 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Ustariz | 2015-2019 | .265 | 27 | 197 | 0 | 0 | 0 | 0.00 | 0 |
| Logan Uxa | 2015-2025 | .250 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
