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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Huibrecht Ubbens | 2033-2036 | 8 | 7 | .533 | 3.31 | 44 | 10 | 0 | 0 | 9 | 108.2 | 88 | 40 | 10 | 41 | 104 |
| Kyoji Uchiyama | 2022-2028 | 13 | 11 | .542 | 2.25 | 158 | 0 | 0 | 0 | 64 | 152.0 | 110 | 38 | 11 | 47 | 194 |
| Shunsen Ueda | 2030-2030 | 3 | 5 | .375 | 7.79 | 30 | 8 | 0 | 0 | 1 | 67.0 | 92 | 58 | 14 | 26 | 35 |
| Tsugumichi Uemura | 2014-2014 | 1 | 0 | 1.000 | 4.91 | 3 | 0 | 0 | 0 | 0 | 3.2 | 4 | 2 | 0 | 2 | 4 |
| Rikiya Ueno | 2022-2022 | 4 | 1 | .800 | 2.09 | 39 | 0 | 0 | 0 | 1 | 47.1 | 36 | 11 | 0 | 14 | 27 |
| Lewis Uige | 2033-2038 | 16 | 25 | .390 | 4.08 | 58 | 58 | 2 | 1 | 0 | 350.1 | 310 | 159 | 20 | 153 | 271 |
| Chong-chin Um | 2038-2039 | 9 | 16 | .360 | 5.28 | 59 | 37 | 0 | 0 | 2 | 225.0 | 256 | 132 | 19 | 95 | 174 |
| Sotatsu Uno | 2008-2011 | 22 | 14 | .611 | 3.38 | 198 | 12 | 0 | 0 | 27 | 287.1 | 257 | 108 | 30 | 108 | 227 |
| Josh Urien | 2026-2039 | 19 | 20 | .487 | 2.45 | 122 | 44 | 1 | 0 | 2 | 411.1 | 374 | 112 | 25 | 76 | 346 |
