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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ieyoshi Uchida | 2043-2045 | 12 | 17 | .414 | 4.78 | 47 | 34 | 0 | 0 | 0 | 184.2 | 173 | 98 | 33 | 88 | 211 |
| Nobukazu Uchiyama | 2024-2025 | 4 | 2 | .667 | 4.20 | 50 | 0 | 0 | 0 | 1 | 70.2 | 82 | 33 | 8 | 23 | 63 |
| Tekkan Uchiyama | 2038-2038 | 5 | 1 | .833 | 1.68 | 9 | 9 | 1 | 1 | 0 | 64.1 | 47 | 12 | 3 | 10 | 100 |
| Marcello Udinga | 2026-2026 | 1 | 0 | 1.000 | 3.91 | 18 | 0 | 0 | 0 | 0 | 23.0 | 19 | 10 | 2 | 13 | 27 |
| John Uhlman | 2044-2048 | 20 | 35 | .364 | 4.35 | 123 | 63 | 1 | 0 | 20 | 428.0 | 422 | 207 | 81 | 151 | 385 |
| Clarence Underwood | 2032-2036 | 10 | 7 | .588 | 3.80 | 153 | 0 | 0 | 0 | 5 | 184.2 | 188 | 78 | 13 | 69 | 164 |
| Rick Upton | 2028-2032 | 25 | 18 | .581 | 3.27 | 207 | 41 | 0 | 0 | 45 | 391.1 | 334 | 142 | 37 | 142 | 478 |
| Diego Urbina | 2023-2024 | 4 | 1 | .800 | 6.69 | 20 | 0 | 0 | 0 | 0 | 40.1 | 52 | 30 | 1 | 23 | 39 |
| Carlos Usino | 2023-2024 | 9 | 14 | .391 | 4.31 | 49 | 36 | 0 | 0 | 3 | 217.0 | 222 | 104 | 13 | 66 | 189 |
