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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 |
|---|---|---|---|---|---|---|---|---|---|
| Milán Udris | 1902-1905 | .262 | 0 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Urayoán Ugarte | 1903-1905 | .255 | 0 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Uhlman | 1908-1911 | .000 | 0 | 0 | 1 | 1 | 0 | 4.23 | 6 |
| Felipe Ulibarri | 1910-1910 | .000 | 0 | 0 | 1 | 4 | 1 | 5.48 | 9 |
| Prudencio Ulloa | 1904-1912 | .000 | 0 | 0 | 13 | 16 | 0 | 3.15 | 120 |
| Aldo Umana | 1904-1905 | .234 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Uranio Umanzor | 1901-1902 | .183 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Graham Underwood | 1902-1913 | .281 | 25 | 678 | 2 | 1 | 2 | 3.46 | 11 |
| Argimiro Urbina | 1904-1904 | .250 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Carmelo Urbina | 1901-1902 | .000 | 0 | 0 | 44 | 39 | 0 | 3.27 | 259 |
| Polinario Urbina | 1913-1913 | .228 | 0 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Cristián Urdialez | 1903-1904 | .160 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Natanael Urenda | 1911-1913 | .202 | 7 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Noé Ureta | 1909-1913 | .191 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Adolfo Ureña | 1912-1913 | .000 | 0 | 0 | 24 | 11 | 0 | 2.25 | 105 |
| Turlough Ureña | 1904-1913 | .278 | 6 | 689 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Uribe | 1906-1908 | .193 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ludovico Uribe | 1910-1913 | .000 | 0 | 0 | 15 | 19 | 9 | 2.55 | 107 |
| Pedro Uribe | 1911-1911 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Uribe | 1908-1911 | .409 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Cecilio Uriostégui | 1910-1913 | .217 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Pandolfo Urive | 1906-1913 | .259 | 5 | 368 | 0 | 0 | 0 | 0.00 | 0 |
| Uriel Urrea | 1908-1913 | .000 | 0 | 0 | 28 | 40 | 3 | 3.86 | 179 |
| Buenaventura Urrutia | 1906-1913 | .313 | 11 | 646 | 0 | 0 | 0 | 0.00 | 0 |
| Federico Urtiaga | 1904-1913 | .000 | 0 | 0 | 192 | 144 | 1 | 2.57 | 1664 |
| Luis Urías | 1904-1905 | .000 | 0 | 0 | 25 | 32 | 0 | 2.87 | 157 |
| Mercuriano Urías | 1903-1903 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Urías | 1912-1913 | .275 | 4 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Utting | 1902-1902 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
