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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bo-young U | 2027-2028 | .314 | 7 | 152 | 0 | 0 | 0 | 0.00 | 0 |
| Chan-u U | 2029-2031 | .274 | 8 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Jae-hyung U | 2021-2022 | .243 | 70 | 167 | 0 | 0 | 0 | 0.00 | 0 |
| Joong-geun U | 2021-2022 | .000 | 0 | 0 | 20 | 5 | 9 | 2.39 | 214 |
| Kwan U | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 17 |
| Kyu-cheol U | 2027-2027 | .000 | 0 | 0 | 2 | 4 | 1 | 9.16 | 37 |
| Kyu-cheol U | 2025-2025 | .326 | 1 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Man-su U | 2025-2025 | .000 | 0 | 0 | 3 | 2 | 1 | 7.30 | 18 |
| Ramon Ubbels | 2025-2025 | .299 | 13 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Natsume Uchiyama | 2026-2028 | .000 | 0 | 0 | 9 | 12 | 16 | 5.92 | 184 |
| Douggie Udall | 2028-2030 | .218 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Udall | 2018-2020 | .000 | 0 | 0 | 19 | 14 | 3 | 5.84 | 332 |
| Donovan Udinga | 2029-2031 | .323 | 2 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Henk Udinga | 2027-2029 | .339 | 25 | 212 | 0 | 0 | 0 | 0.00 | 0 |
| Yasutake Ueda | 2021-2022 | .216 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshinori Ueda | 2029-2030 | .399 | 19 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| Ken'ichi Uemura | 2022-2023 | .224 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Taisuke Ueno | 2027-2028 | .000 | 0 | 0 | 18 | 2 | 4 | 6.61 | 83 |
| Isei Uenohara | 2030-2031 | .303 | 9 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Will Uenohara | 2029-2029 | .216 | 1 | 28 | 6 | 10 | 0 | 7.09 | 50 |
| Lonnie Uhl | 2015-2017 | .000 | 0 | 0 | 4 | 3 | 0 | 6.80 | 46 |
| Paul Uhlman | 2022-2022 | .000 | 0 | 0 | 4 | 1 | 1 | 3.39 | 63 |
| Powell Ulrich | 2030-2031 | .268 | 1 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Kyu-cheol Um | 2030-2030 | .167 | 0 | 0 | 3 | 4 | 4 | 4.06 | 23 |
| Katsunosuki Umaba | 2024-2026 | .000 | 0 | 0 | 23 | 6 | 5 | 6.20 | 126 |
| Noburo Umaba | 2027-2027 | .000 | 0 | 0 | 9 | 4 | 0 | 5.61 | 77 |
| Yasujiro Umaba | 2026-2026 | .000 | 0 | 0 | 8 | 5 | 1 | 5.59 | 54 |
| Bill Underhill | 2031-2031 | .000 | 0 | 0 | 4 | 3 | 0 | 4.06 | 47 |
| Callum Underhill | 2027-2028 | .000 | 0 | 0 | 11 | 1 | 0 | 5.58 | 77 |
| Richard Underwood | 2024-2026 | .287 | 74 | 302 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Robin Underwood | 2026-2027 | .365 | 2 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas Unger | 2011-2012 | .000 | 0 | 0 | 4 | 2 | 1 | 8.63 | 55 |
| Greg Unzueta | 2015-2017 | .247 | 17 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Upham | 2019-2021 | .000 | 0 | 0 | 6 | 13 | 2 | 7.79 | 187 |
| Ben Upton | 2027-2029 | .281 | 32 | 180 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Upton | 2004-2007 | .307 | 70 | 179 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Urbina | 2010-2012 | .000 | 0 | 0 | 3 | 12 | 0 | 9.93 | 92 |
| José Uribe | 2010-2012 | .000 | 0 | 0 | 5 | 8 | 4 | 10.26 | 83 |
| Edgardo Uriorte | 2029-2030 | .281 | 5 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Cristo Urra | 2027-2028 | .261 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Urruticodez | 2023-2023 | .000 | 0 | 0 | 4 | 3 | 31 | 1.92 | 85 |
