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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Donkal Ubriani | 2019-2019 | 3 | 9 | .250 | 5.73 | 19 | 19 | 0 | 0 | 0 | 92.2 | 123 | 59 | 4 | 31 | 73 |
| Kawanari Uchida | 2026-2031 | 6 | 16 | .273 | 4.24 | 118 | 0 | 0 | 0 | 55 | 127.1 | 99 | 60 | 17 | 53 | 181 |
| Koryusai Uchida | 2023-2024 | 15 | 15 | .500 | 4.88 | 50 | 50 | 0 | 0 | 0 | 267.2 | 286 | 145 | 25 | 121 | 256 |
| Mushanokoji Uchida | 2013-2013 | 11 | 9 | .550 | 2.72 | 27 | 27 | 1 | 1 | 0 | 175.2 | 163 | 53 | 11 | 39 | 148 |
| Naizen Uchiyama | 2025-2028 | 22 | 16 | .579 | 3.62 | 91 | 48 | 0 | 0 | 2 | 313.0 | 277 | 126 | 14 | 145 | 319 |
| Arsya Udayan | 2021-2022 | 0 | 1 | .000 | 6.62 | 16 | 2 | 0 | 0 | 0 | 35.1 | 41 | 26 | 4 | 25 | 28 |
| Tagashashi Ueda | 2024-2029 | 27 | 26 | .509 | 4.43 | 238 | 60 | 0 | 0 | 7 | 499.2 | 515 | 246 | 37 | 236 | 502 |
| Yoshiaga Ueno | 2016-2016 | 4 | 12 | .250 | 3.97 | 21 | 21 | 0 | 0 | 0 | 118.0 | 108 | 52 | 7 | 44 | 94 |
| Masayuki Umaba | 2027-2027 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 0 | 0 | 0 | 2 |
| Jamal Underwood | 2019-2023 | 15 | 11 | .577 | 5.13 | 68 | 33 | 0 | 0 | 1 | 221.0 | 222 | 126 | 13 | 116 | 210 |
| Bartolo Urbina | 2029-2029 | 0 | 0 | .000 | 6.35 | 3 | 0 | 0 | 0 | 0 | 5.2 | 7 | 4 | 0 | 4 | 6 |
| Aidan Uren | 2021-2030 | 6 | 4 | .600 | 3.55 | 23 | 17 | 0 | 0 | 2 | 104.0 | 92 | 41 | 5 | 34 | 73 |
