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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 |
|---|---|---|---|---|---|---|---|---|---|
| Edwin Uceta | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 6.00 | 19 |
| Raider Uceta | 2024-2025 | .229 | 17 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Koji Uehara | 2012-2012 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
| Erich Uelmen | 2020-2023 | .000 | 0 | 0 | 8 | 10 | 0 | 4.83 | 194 |
| Dan Uggla | 2014-2014 | .286 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Enmanuel Ulloa | 2000-2006 | .000 | 0 | 0 | 5 | 8 | 2 | 5.73 | 47 |
| Manny Ulloa | 2027-2031 | .317 | 57 | 250 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ulrich | 2027-2032 | .000 | 0 | 0 | 34 | 18 | 9 | 4.18 | 402 |
| Mike Umhoefer | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 4 |
| Andy Underwood | 2031-2033 | .217 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Duane Underwood Jr. | 2018-2028 | .121 | 0 | 1 | 9 | 18 | 0 | 4.51 | 264 |
| Nic Ungs | 2006-2008 | .000 | 0 | 0 | 16 | 17 | 2 | 4.78 | 173 |
| Riley Unroe | 2018-2018 | .263 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Updike | 2030-2030 | .000 | 0 | 0 | 4 | 3 | 0 | 8.03 | 66 |
| Jared Uptegrove | 2034-2036 | .000 | 0 | 0 | 0 | 0 | 0 | 5.50 | 9 |
| Mike Upton | 2027-2029 | .077 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Upton Jr. | 2015-2017 | .263 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Uranga | 2028-2031 | .000 | 0 | 0 | 12 | 10 | 6 | 3.92 | 219 |
| Nelson Urbina | 2035-2036 | .285 | 34 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Urckfitz | 2011-2015 | 1.000 | 0 | 0 | 1 | 7 | 0 | 4.76 | 72 |
| Hector Urena | 2026-2031 | .345 | 7 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Jhoan Urena | 2017-2017 | .227 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Urena | 2015-2019 | .217 | 0 | 2 | 9 | 4 | 0 | 2.83 | 84 |
| Miguel Urena | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Urena | 2027-2028 | .289 | 15 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Urias | 2028-2031 | .296 | 9 | 127 | 0 | 0 | 0 | 0.00 | 0 |
| Julio Urias | 2015-2025 | .118 | 0 | 4 | 13 | 7 | 0 | 3.91 | 159 |
| Luis Urias | 2016-2020 | .309 | 31 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Urias | 2018-2019 | .262 | 14 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Sandy Uribe | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tony Uribe | 2036-2036 | .000 | 0 | 0 | 1 | 0 | 0 | 5.12 | 20 |
| Sean Urquhart | 2036-2036 | .222 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Urquidy | 2019-2022 | .000 | 0 | 0 | 17 | 11 | 0 | 4.15 | 259 |
| Randy Utting | 2032-2032 | .272 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
