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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 | 2029-2031 | .301 | 9 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Kwan U | 2027-2030 | .000 | 0 | 0 | 31 | 32 | 0 | 4.99 | 280 |
| Kyu-cheol U | 2028-2031 | .000 | 0 | 0 | 17 | 10 | 4 | 5.05 | 242 |
| Man-su U | 2026-2029 | .000 | 0 | 0 | 8 | 4 | 2 | 4.60 | 103 |
| Alberto Uballe | 2026-2029 | .000 | 0 | 0 | 15 | 25 | 0 | 6.18 | 200 |
| Kelsey Ubbels | 2027-2030 | .266 | 37 | 174 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Ubbels | 2026-2029 | .236 | 17 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Ubbels | 2022-2024 | .212 | 19 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Horiuchi Uchida | 2027-2027 | .000 | 0 | 0 | 2 | 2 | 1 | 2.55 | 30 |
| Iwane Uchida | 2026-2028 | .280 | 81 | 272 | 0 | 0 | 0 | 0.00 | 0 |
| Kanko Uchida | 2022-2023 | .000 | 0 | 0 | 21 | 16 | 0 | 3.50 | 348 |
| Natsume Uchiyama | 2029-2031 | .000 | 0 | 0 | 1 | 1 | 0 | 6.51 | 35 |
| Takeichi Uchiyama | 2029-2031 | .276 | 39 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Douggie Udall | 2031-2031 | .257 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Kjeld Udinga | 2022-2022 | .000 | 0 | 0 | 11 | 7 | 0 | 2.66 | 179 |
| Raoul Udinga | 2023-2024 | .241 | 25 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Kikaku Ueda | 2022-2024 | .217 | 86 | 229 | 0 | 0 | 0 | 0.00 | 0 |
| Shunen Ueda | 2025-2026 | .244 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ken'ichi Uemura | 2024-2027 | .152 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Taisuke Ueno | 2031-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Takechi Uenohara | 2021-2022 | .260 | 5 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Will Uenohara | 2030-2031 | .333 | 0 | 0 | 5 | 4 | 1 | 5.09 | 77 |
| Yasujiro Ugaki | 2023-2024 | .450 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Uggla | 2004-2007 | .308 | 50 | 210 | 0 | 0 | 0 | 0.00 | 0 |
| Lonnie Uhl | 2018-2022 | .000 | 0 | 0 | 16 | 23 | 82 | 5.17 | 388 |
| Andy Uhlman | 2022-2022 | .237 | 2 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Ullyatt | 2013-2014 | .000 | 0 | 0 | 12 | 9 | 36 | 4.79 | 119 |
| Rod Ulrich | 2025-2027 | .220 | 2 | 29 | 0 | 0 | 0 | 9.00 | 2 |
| Kyu-cheol Um | 2031-2031 | .000 | 0 | 0 | 1 | 0 | 0 | 5.02 | 9 |
| Hitoshi Umaba | 2023-2024 | .143 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Katsunosuki Umaba | 2027-2030 | .000 | 0 | 0 | 24 | 27 | 0 | 5.36 | 270 |
| Noburo Umaba | 2028-2031 | .000 | 0 | 0 | 30 | 38 | 0 | 4.42 | 402 |
| Yasujiro Umaba | 2027-2030 | .000 | 0 | 0 | 15 | 8 | 1 | 4.66 | 175 |
| Matt Underhay | 2014-2014 | .000 | 0 | 0 | 4 | 6 | 1 | 7.00 | 70 |
| Callum Underhill | 2029-2031 | .000 | 0 | 0 | 3 | 3 | 0 | 7.28 | 40 |
| Zak Underhill | 2023-2024 | .000 | 0 | 0 | 4 | 14 | 0 | 5.74 | 131 |
| Dave Underwood | 2026-2029 | .266 | 14 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Underwood | 2018-2019 | .000 | 0 | 0 | 21 | 10 | 0 | 1.40 | 406 |
| Robin Underwood | 2028-2031 | .263 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas Unger | 2013-2018 | .000 | 0 | 0 | 9 | 12 | 7 | 5.28 | 143 |
| Greg Unzueta | 2018-2022 | .250 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Upchurch | 2026-2026 | .286 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Upton | 2030-2031 | .260 | 38 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Hal Upton | 2030-2031 | .000 | 0 | 0 | 8 | 1 | 3 | 5.37 | 76 |
| Rory Upton | 2028-2031 | .279 | 7 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Urbina | 2023-2024 | .000 | 0 | 0 | 4 | 4 | 1 | 4.17 | 80 |
| Jaime Urbina | 2008-2008 | .364 | 3 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Urbina | 2023-2024 | .213 | 27 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Urbina | 2016-2017 | .000 | 0 | 0 | 7 | 5 | 9 | 3.57 | 115 |
| Vicente Urbina | 2013-2018 | .000 | 0 | 0 | 12 | 17 | 79 | 4.09 | 265 |
| Alfonso Uribe | 2026-2027 | .000 | 0 | 0 | 20 | 16 | 0 | 4.42 | 137 |
| José Uribe | 2013-2013 | .238 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| José Uribe | 2013-2017 | .000 | 0 | 0 | 1 | 0 | 1 | 3.68 | 7 |
| Manuel Uribe | 2026-2027 | .000 | 0 | 0 | 14 | 19 | 0 | 5.75 | 132 |
| Edgardo Uriorte | 2031-2031 | .224 | 11 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Urquart | 2015-2016 | .250 | 28 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Urruticodez | 2024-2026 | .000 | 0 | 0 | 6 | 14 | 104 | 2.39 | 241 |
| António Urtasún | 2015-2015 | .000 | 0 | 0 | 2 | 2 | 0 | 4.41 | 32 |
| Félix Usog | 2023-2024 | .000 | 0 | 0 | 16 | 7 | 10 | 3.70 | 193 |
| Enrique Utzios | 2019-2019 | .247 | 13 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
