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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ryutaro Uchiyama | 2029-2035 | 23 | 36 | .390 | 4.24 | 334 | 0 | 0 | 0 | 86 | 357.0 | 366 | 168 | 40 | 167 | 335 |
| Kiyomitsu Ueda | 2049-2049 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| John Ukon | 2021-2036 | 47 | 37 | .560 | 4.81 | 623 | 0 | 0 | 0 | 87 | 686.1 | 711 | 367 | 112 | 257 | 741 |
| Lanny Ulrich | 2026-2028 | 3 | 2 | .600 | 3.61 | 45 | 0 | 0 | 0 | 0 | 67.1 | 77 | 27 | 7 | 17 | 40 |
| Bruce Ung | 2022-2032 | 15 | 33 | .313 | 6.03 | 74 | 70 | 4 | 1 | 0 | 414.2 | 504 | 278 | 66 | 208 | 233 |
| Jesús Urbina | 2042-2055 | 20 | 27 | .426 | 5.63 | 180 | 55 | 2 | 1 | 2 | 476.2 | 515 | 298 | 92 | 220 | 364 |
| Ugueth Urbina | 2001-2013 | 65 | 73 | .471 | 3.86 | 940 | 0 | 0 | 0 | 281 | 1102.1 | 1047 | 473 | 106 | 453 | 1161 |
| Lino Urdaneta | 2005-2019 | 92 | 62 | .597 | 3.86 | 1065 | 0 | 0 | 0 | 130 | 1202.1 | 1152 | 516 | 99 | 368 | 954 |
| Ramiro Uribe | 2053-2055 | 0 | 0 | .000 | 2.70 | 4 | 0 | 0 | 0 | 0 | 3.1 | 3 | 1 | 0 | 2 | 0 |
| Benji Urrutia | 2017-2029 | 19 | 17 | .528 | 5.51 | 209 | 0 | 0 | 0 | 4 | 254.2 | 333 | 156 | 32 | 94 | 145 |
