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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 | 2019-2019 | .000 | 0 | 0 | 3 | 9 | 0 | 5.73 | 73 |
| Hirofumi Uchida | 2029-2030 | .285 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Kan Uchida | 2020-2020 | .154 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Uchida | 2017-2026 | .247 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Kawanari Uchida | 2026-2031 | .000 | 0 | 0 | 6 | 16 | 55 | 4.24 | 181 |
| Koryusai Uchida | 2023-2024 | .000 | 0 | 0 | 15 | 15 | 0 | 4.88 | 256 |
| Mushanokoji Uchida | 2013-2013 | .000 | 0 | 0 | 11 | 9 | 0 | 2.72 | 148 |
| Ryunosuke Uchida | 2027-2028 | .249 | 8 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Shosuke Uchida | 2018-2024 | .213 | 8 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Takuro Uchida | 2029-2031 | .230 | 8 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Naizen Uchiyama | 2025-2028 | .000 | 0 | 0 | 22 | 16 | 2 | 3.62 | 319 |
| Tokuhei Uchiyama | 2020-2022 | .261 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Yasujiro Uchiyama | 2017-2018 | .310 | 10 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Arsya Udayan | 2021-2022 | .000 | 0 | 0 | 0 | 1 | 0 | 6.62 | 28 |
| Cristo Uden | 2025-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kazunari Ueda | 2015-2016 | .256 | 11 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Tagashashi Ueda | 2024-2029 | .000 | 0 | 0 | 27 | 26 | 7 | 4.43 | 502 |
| Takafumi Ueno | 2026-2029 | .275 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuginori Ueno | 2026-2029 | .216 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiaga Ueno | 2016-2016 | .000 | 0 | 0 | 4 | 12 | 0 | 3.97 | 94 |
| Blair Uige | 2027-2029 | .278 | 17 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Masayuki Umaba | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Mitsuhide Umaba | 2017-2027 | .221 | 14 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Motoki Umaba | 2023-2023 | .177 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Abdur Rashid Umrani | 2028-2028 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kamadev Umrigar | 2023-2025 | .210 | 8 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Jamal Underwood | 2019-2023 | .000 | 0 | 0 | 15 | 11 | 1 | 5.13 | 210 |
| Francis Unicombe | 2026-2027 | .257 | 7 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Morgan Unicume | 2028-2028 | .286 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jim Unknown | 2025-2025 | .667 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Unknown | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bartolo Urbina | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 6.35 | 6 |
| Aidan Uren | 2021-2030 | .000 | 0 | 0 | 6 | 4 | 2 | 3.55 | 73 |
| Guillermo Urive | 2025-2028 | .217 | 3 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Angel Uroza | 2032-2032 | .308 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Hiyutaro Ushijima | 2029-2030 | .229 | 10 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Vui Ut | 2021-2024 | .207 | 3 | 46 | 0 | 0 | 0 | 0.00 | 0 |
