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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 |
|---|---|---|---|---|---|---|---|---|---|
| Joong-geun U | 2025-2026 | .000 | 0 | 0 | 4 | 3 | 0 | 6.06 | 48 |
| Kyu-cheol U | 2028-2029 | .265 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Kelsey Ubbels | 2031-2031 | .228 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Iwane Uchida | 2030-2030 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kanko Uchida | 2025-2026 | .000 | 0 | 0 | 3 | 1 | 1 | 2.98 | 49 |
| Kjeld Udinga | 2024-2024 | .000 | 0 | 0 | 3 | 5 | 15 | 4.39 | 29 |
| Wesley Udinga | 2029-2029 | .000 | 0 | 0 | 2 | 0 | 0 | 0.00 | 4 |
| Suezo Ueno | 2030-2031 | .182 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Bert Umarzai | 2024-2024 | .000 | 0 | 0 | 8 | 5 | 10 | 5.40 | 82 |
| Denny Underwood | 2002-2005 | .222 | 7 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Underwood | 2020-2020 | .000 | 0 | 0 | 7 | 9 | 0 | 4.20 | 106 |
| Richard Underwood | 2030-2030 | .332 | 8 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| B J Upton | 2009-2009 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Upton | 2008-2010 | .243 | 28 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Jaime Urbina | 2009-2017 | .296 | 4 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Mitch Uridge | 2025-2026 | .216 | 1 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Urruticodez | 2029-2029 | .000 | 0 | 0 | 3 | 2 | 21 | 3.30 | 113 |
| Will Urry | 2019-2020 | .000 | 0 | 0 | 16 | 18 | 0 | 4.20 | 148 |
| Félix Usog | 2028-2028 | .000 | 0 | 0 | 2 | 2 | 2 | 3.31 | 61 |
| Dwayne Uttley | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 6.10 | 4 |
