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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 | 2022-2032 | .000 | 0 | 0 | 5 | 4 | 0 | 3.32 | 93 |
| Katsumi Uchida | 2020-2029 | .268 | 65 | 284 | 0 | 0 | 0 | 0.00 | 0 |
| Kawanari Uchida | 2027-2032 | .000 | 0 | 0 | 3 | 13 | 15 | 7.33 | 77 |
| Koryusai Uchida | 2025-2032 | .000 | 0 | 0 | 9 | 9 | 0 | 5.23 | 194 |
| Mushanokoji Uchida | 2016-2030 | .000 | 0 | 0 | 40 | 25 | 3 | 5.34 | 339 |
| Ryunosuke Uchida | 2029-2031 | .216 | 5 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Naizen Uchiyama | 2029-2032 | .000 | 0 | 0 | 17 | 20 | 27 | 4.90 | 200 |
| Tokuhei Uchiyama | 2023-2026 | .270 | 17 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Yasujiro Uchiyama | 2022-2022 | .283 | 12 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Kazunari Ueda | 2016-2020 | .271 | 41 | 254 | 0 | 0 | 0 | 0.00 | 0 |
| Takafumi Ueno | 2031-2032 | .223 | 5 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiaga Ueno | 2016-2019 | .000 | 0 | 0 | 13 | 19 | 4 | 6.38 | 166 |
| Mitsuhide Umaba | 2020-2028 | .237 | 18 | 204 | 0 | 0 | 0 | 0.00 | 0 |
| Kamadev Umrigar | 2025-2025 | .118 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jamal Underwood | 2021-2021 | .000 | 0 | 0 | 0 | 4 | 0 | 12.18 | 15 |
| Francis Unicombe | 2030-2031 | .272 | 7 | 63 | 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 | 1 | 0.00 | 1 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aidan Uren | 2022-2029 | .000 | 0 | 0 | 21 | 20 | 29 | 5.32 | 373 |
| Guillermo Urive | 2029-2032 | .199 | 10 | 32 | 0 | 0 | 0 | 10.80 | 1 |
| Hiyutaro Ushijima | 2031-2032 | .323 | 13 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Vui Ut | 2025-2027 | .244 | 15 | 78 | 0 | 0 | 0 | 0.00 | 0 |
