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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Joong-geun U | 2021-2022 | 20 | 5 | .800 | 2.39 | 105 | 0 | 0 | 0 | 9 | 188.1 | 119 | 50 | 9 | 71 | 214 |
| Kwan U | 2026-2026 | 0 | 0 | .000 | 6.75 | 18 | 0 | 0 | 0 | 0 | 32.0 | 40 | 24 | 1 | 20 | 17 |
| Kyu-cheol U | 2027-2027 | 2 | 4 | .333 | 9.16 | 25 | 0 | 0 | 0 | 1 | 37.1 | 71 | 38 | 4 | 23 | 37 |
| Man-su U | 2025-2025 | 3 | 2 | .600 | 7.30 | 19 | 0 | 0 | 0 | 1 | 24.2 | 26 | 20 | 6 | 19 | 18 |
| Natsume Uchiyama | 2026-2028 | 9 | 12 | .429 | 5.92 | 115 | 0 | 0 | 0 | 16 | 208.1 | 232 | 137 | 28 | 119 | 184 |
| Jim Udall | 2018-2020 | 19 | 14 | .576 | 5.84 | 177 | 2 | 0 | 0 | 3 | 296.0 | 306 | 192 | 57 | 147 | 332 |
| Taisuke Ueno | 2027-2028 | 18 | 2 | .900 | 6.61 | 65 | 4 | 0 | 0 | 4 | 171.2 | 217 | 126 | 35 | 103 | 83 |
| Will Uenohara | 2029-2029 | 6 | 10 | .375 | 7.09 | 23 | 23 | 0 | 0 | 0 | 100.1 | 137 | 79 | 16 | 60 | 50 |
| Lonnie Uhl | 2015-2017 | 4 | 3 | .571 | 6.80 | 22 | 0 | 0 | 0 | 0 | 43.2 | 57 | 33 | 9 | 20 | 46 |
| Paul Uhlman | 2022-2022 | 4 | 1 | .800 | 3.39 | 26 | 0 | 0 | 0 | 1 | 61.0 | 51 | 23 | 6 | 27 | 63 |
| Kyu-cheol Um | 2030-2030 | 3 | 4 | .429 | 4.06 | 35 | 0 | 0 | 0 | 4 | 44.1 | 43 | 20 | 4 | 19 | 23 |
| Katsunosuki Umaba | 2024-2026 | 23 | 6 | .793 | 6.20 | 138 | 3 | 0 | 0 | 5 | 305.0 | 363 | 210 | 45 | 178 | 126 |
| Noburo Umaba | 2027-2027 | 9 | 4 | .692 | 5.61 | 24 | 24 | 0 | 0 | 0 | 112.1 | 135 | 70 | 19 | 49 | 77 |
| Yasujiro Umaba | 2026-2026 | 8 | 5 | .615 | 5.59 | 38 | 0 | 0 | 0 | 1 | 75.2 | 84 | 47 | 12 | 37 | 54 |
| Bill Underhill | 2031-2031 | 4 | 3 | .571 | 4.06 | 29 | 6 | 0 | 0 | 0 | 64.1 | 68 | 29 | 4 | 31 | 47 |
| Callum Underhill | 2027-2028 | 11 | 1 | .917 | 5.58 | 54 | 2 | 0 | 0 | 0 | 117.2 | 129 | 73 | 15 | 74 | 77 |
| Thomas Unger | 2011-2012 | 4 | 2 | .667 | 8.63 | 77 | 0 | 0 | 0 | 1 | 112.2 | 169 | 108 | 25 | 125 | 55 |
| Jack Upham | 2019-2021 | 6 | 13 | .316 | 7.79 | 157 | 0 | 0 | 0 | 2 | 209.0 | 267 | 181 | 47 | 164 | 187 |
| Vicente Urbina | 2010-2012 | 3 | 12 | .200 | 9.93 | 31 | 31 | 0 | 0 | 0 | 135.0 | 212 | 149 | 34 | 106 | 92 |
| José Uribe | 2010-2012 | 5 | 8 | .385 | 10.26 | 113 | 0 | 0 | 0 | 4 | 143.0 | 228 | 163 | 30 | 156 | 83 |
| Juan Urruticodez | 2023-2023 | 4 | 3 | .571 | 1.92 | 55 | 0 | 0 | 0 | 31 | 61.0 | 36 | 13 | 5 | 23 | 85 |
