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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 | 2022-2032 | 5 | 4 | .556 | 3.32 | 16 | 16 | 0 | 0 | 0 | 86.2 | 70 | 32 | 6 | 24 | 93 |
| Kawanari Uchida | 2027-2032 | 3 | 13 | .188 | 7.33 | 83 | 0 | 0 | 0 | 15 | 77.1 | 90 | 63 | 16 | 53 | 77 |
| Koryusai Uchida | 2025-2032 | 9 | 9 | .500 | 5.23 | 36 | 36 | 0 | 0 | 0 | 186.0 | 204 | 108 | 27 | 82 | 194 |
| Mushanokoji Uchida | 2016-2030 | 40 | 25 | .615 | 5.34 | 150 | 78 | 0 | 0 | 3 | 512.2 | 650 | 304 | 58 | 150 | 339 |
| Naizen Uchiyama | 2029-2032 | 17 | 20 | .459 | 4.90 | 188 | 10 | 0 | 0 | 27 | 233.1 | 264 | 127 | 28 | 107 | 200 |
| Yoshiaga Ueno | 2016-2019 | 13 | 19 | .406 | 6.38 | 109 | 27 | 0 | 0 | 4 | 223.0 | 286 | 158 | 13 | 97 | 166 |
| Jamal Underwood | 2021-2021 | 0 | 4 | .000 | 12.18 | 7 | 7 | 0 | 0 | 0 | 27.1 | 40 | 37 | 8 | 33 | 15 |
| Jim Unknown | 2025-2025 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 0.1 | 0 | 0 | 0 | 0 | 1 |
| Aidan Uren | 2022-2029 | 21 | 20 | .512 | 5.32 | 279 | 9 | 0 | 0 | 29 | 451.2 | 493 | 267 | 63 | 212 | 373 |
| Guillermo Urive | 2029-2032 | 0 | 0 | .000 | 10.80 | 1 | 0 | 0 | 0 | 0 | 1.2 | 0 | 2 | 0 | 3 | 1 |
