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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Marcos Ubarri | 1985-1996 | 44 | 38 | .537 | 4.85 | 700 | 0 | 0 | 0 | 56 | 655.2 | 665 | 353 | 88 | 332 | 501 |
| Masamune Ueda | 2035-2038 | 13 | 17 | .433 | 5.35 | 46 | 46 | 0 | 0 | 0 | 245.2 | 267 | 146 | 42 | 127 | 146 |
| Seitaro Ugaki | 2041-2044 | 10 | 6 | .625 | 5.07 | 71 | 4 | 0 | 0 | 6 | 143.2 | 135 | 81 | 32 | 40 | 136 |
| Kaden Umair | 2052-2055 | 16 | 17 | .485 | 4.89 | 158 | 43 | 0 | 0 | 4 | 425.1 | 475 | 231 | 57 | 158 | 302 |
| Rio Underhill | 2025-2034 | 76 | 75 | .503 | 4.26 | 287 | 176 | 10 | 4 | 4 | 1388.1 | 1398 | 657 | 202 | 404 | 939 |
| William Upton | 1999-2006 | 12 | 26 | .316 | 5.39 | 68 | 45 | 9 | 0 | 0 | 319.0 | 414 | 191 | 47 | 88 | 206 |
| Juan Urdiano | 2021-2032 | 23 | 42 | .354 | 4.40 | 329 | 35 | 0 | 0 | 18 | 554.1 | 540 | 271 | 67 | 175 | 482 |
| Pedro Urena | 1983-1989 | 26 | 28 | .481 | 5.56 | 353 | 25 | 0 | 0 | 3 | 516.0 | 577 | 319 | 71 | 228 | 297 |
| Aleixo Urgeses | 2037-2043 | 22 | 15 | .595 | 4.60 | 216 | 0 | 0 | 0 | 20 | 276.0 | 275 | 141 | 34 | 130 | 259 |
| Hamilton Urglar | 2028-2028 | 2 | 5 | .286 | 9.76 | 9 | 9 | 0 | 0 | 0 | 39.2 | 54 | 43 | 9 | 46 | 28 |
| Augusto Urreiztieta | 2055-2055 | 2 | 0 | 1.000 | 5.87 | 16 | 0 | 0 | 0 | 0 | 23.0 | 33 | 15 | 4 | 6 | 17 |
