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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 |
|---|---|---|---|---|---|---|---|---|---|
| Donkal Ubriani | 2020-2021 | .000 | 0 | 0 | 28 | 15 | 0 | 3.64 | 330 |
| Katsumi Uchida | 2018-2020 | .256 | 38 | 201 | 0 | 0 | 0 | 0.00 | 0 |
| Kawanari Uchida | 2028-2032 | .000 | 0 | 0 | 12 | 4 | 30 | 3.82 | 127 |
| Koryusai Uchida | 2024-2025 | .000 | 0 | 0 | 12 | 9 | 0 | 3.81 | 186 |
| Mushanokoji Uchida | 2014-2015 | .000 | 0 | 0 | 18 | 18 | 0 | 4.81 | 199 |
| Ryunosuke Uchida | 2029-2031 | .249 | 4 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Shosuke Uchida | 2020-2023 | .190 | 3 | 32 | 0 | 0 | 0 | 6.75 | 0 |
| Naizen Uchiyama | 2029-2029 | .000 | 0 | 0 | 8 | 4 | 3 | 3.73 | 93 |
| Tokuhei Uchiyama | 2020-2026 | .288 | 11 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Yasujiro Uchiyama | 2018-2021 | .305 | 50 | 254 | 0 | 0 | 0 | 0.00 | 0 |
| Kazunari Ueda | 2016-2016 | .263 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Tagashashi Ueda | 2026-2032 | .000 | 0 | 0 | 12 | 13 | 0 | 4.65 | 193 |
| Takafumi Ueno | 2027-2031 | .239 | 13 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuginori Ueno | 2026-2029 | .147 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiaga Ueno | 2016-2017 | .000 | 0 | 0 | 5 | 6 | 0 | 4.49 | 91 |
| Blair Uige | 2030-2031 | .287 | 8 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Mitsuhide Umaba | 2020-2027 | .263 | 11 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Motoki Umaba | 2023-2023 | .333 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Kamadev Umrigar | 2024-2025 | .224 | 9 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Jamal Underwood | 2020-2023 | .000 | 0 | 0 | 11 | 12 | 0 | 5.88 | 186 |
| Francis Unicombe | 2028-2032 | .287 | 8 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .750 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aidan Uren | 2021-2029 | .000 | 0 | 0 | 12 | 14 | 31 | 4.87 | 244 |
| Pedro Ureno | 2029-2029 | .000 | 0 | 0 | 1 | 1 | 0 | 11.88 | 9 |
| Guillermo Urive | 2026-2032 | .229 | 21 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Hiyutaro Ushijima | 2030-2030 | .313 | 7 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Vui Ut | 2024-2029 | .240 | 20 | 120 | 0 | 0 | 0 | 0.00 | 0 |
