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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fred Uhlman | 1908-1911 | 1 | 1 | .500 | 4.23 | 6 | 3 | 1 | 0 | 0 | 27.2 | 21 | 13 | 0 | 15 | 6 |
| Felipe Ulibarri | 1910-1910 | 1 | 4 | .200 | 5.48 | 10 | 0 | 0 | 0 | 1 | 23.0 | 30 | 14 | 1 | 15 | 9 |
| Prudencio Ulloa | 1904-1912 | 13 | 16 | .448 | 3.15 | 43 | 35 | 11 | 0 | 0 | 291.1 | 255 | 102 | 3 | 133 | 120 |
| Graham Underwood | 1902-1913 | 2 | 1 | .667 | 3.46 | 25 | 0 | 0 | 0 | 2 | 39.0 | 46 | 15 | 3 | 6 | 11 |
| Carmelo Urbina | 1901-1902 | 44 | 39 | .530 | 3.27 | 84 | 84 | 66 | 5 | 0 | 726.0 | 784 | 264 | 14 | 206 | 259 |
| Adolfo Ureña | 1912-1913 | 24 | 11 | .686 | 2.25 | 42 | 39 | 18 | 3 | 0 | 316.1 | 272 | 79 | 2 | 89 | 105 |
| Ludovico Uribe | 1910-1913 | 15 | 19 | .441 | 2.55 | 125 | 0 | 0 | 0 | 9 | 233.0 | 220 | 66 | 1 | 99 | 107 |
| Uriel Urrea | 1908-1913 | 28 | 40 | .412 | 3.86 | 101 | 83 | 17 | 1 | 3 | 621.0 | 685 | 266 | 18 | 201 | 179 |
| Federico Urtiaga | 1904-1913 | 192 | 144 | .571 | 2.57 | 394 | 359 | 225 | 35 | 1 | 3109.1 | 2879 | 889 | 76 | 771 | 1664 |
| Luis Urías | 1904-1905 | 25 | 32 | .439 | 2.87 | 62 | 60 | 43 | 3 | 0 | 510.2 | 449 | 163 | 6 | 176 | 157 |
| Mercuriano Urías | 1903-1903 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 2 | 0 | 0 | 0 | 0 |
| Bill Utting | 1902-1902 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 6.2 | 5 | 0 | 0 | 6 | 3 |
