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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 |
|---|---|---|---|---|---|---|---|---|---|
| Nick Uecker | 1905-1915 | .274 | 5 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Diodoro Uncal | 1908-1915 | .000 | 0 | 0 | 17 | 25 | 4 | 5.76 | 290 |
| Grant Underhill | 1905-1915 | .240 | 16 | 320 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Unger | 1905-1915 | .280 | 34 | 236 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin Upton | 1914-1915 | .284 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Urbina | 1906-1915 | .000 | 0 | 0 | 160 | 139 | 34 | 3.33 | 1426 |
| Cristián Urdialez | 1904-1915 | .289 | 53 | 462 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Uribe | 1909-1915 | .298 | 11 | 195 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Uribe | 1914-1915 | .536 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Uribe | 1911-1915 | .335 | 46 | 184 | 0 | 0 | 0 | 0.00 | 0 |
| Senén Urzúa | 1904-1913 | .251 | 4 | 214 | 0 | 0 | 0 | 0.00 | 0 |
