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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Felipe Ulibarri | 1905-1911 | .000 | 0 | 0 | 24 | 26 | 55 | 2.45 | 285 |
| Benjamin Upton | 1911-1913 | .258 | 8 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Adolfo Ureña | 1908-1913 | .000 | 0 | 0 | 51 | 40 | 2 | 3.54 | 427 |
| Esteban Uria | 1907-1910 | .287 | 2 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Ludovico Uribe | 1906-1913 | .000 | 0 | 0 | 19 | 20 | 18 | 3.08 | 252 |
| Pedro Uribe | 1911-1913 | .272 | 14 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Cecilio Uriostégui | 1911-1912 | .262 | 14 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Pandolfo Urive | 1911-1911 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Diego Urquilla | 1903-1912 | .263 | 21 | 254 | 0 | 0 | 0 | 0.00 | 0 |
| Uriel Urrea | 1911-1911 | .000 | 0 | 0 | 1 | 1 | 0 | 1.69 | 18 |
| Heráclito Urzúa | 1905-1906 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Boanerges Urías | 1913-1913 | .000 | 0 | 0 | 11 | 11 | 0 | 3.09 | 81 |
