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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 |
| Raúl Ulibarri | 1915-1915 | .000 | 0 | 0 | 13 | 16 | 0 | 3.63 | 91 |
| Prudencio Ulloa | 1904-1915 | .000 | 0 | 0 | 18 | 29 | 0 | 3.73 | 165 |
| 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 |
| Étienne Umutesi | 1915-1915 | .245 | 0 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Graham Underwood | 1902-1914 | .281 | 26 | 721 | 2 | 2 | 2 | 3.64 | 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 | 1913-1915 | .238 | 4 | 93 | 0 | 0 | 0 | 13.50 | 0 |
| Cristián Urdialez | 1903-1904 | .160 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Natanael Urenda | 1911-1915 | .201 | 20 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Noé Ureta | 1909-1915 | .185 | 2 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Adolfo Ureña | 1912-1915 | .000 | 0 | 0 | 47 | 45 | 0 | 2.44 | 262 |
| Turlough Ureña | 1904-1915 | .277 | 6 | 712 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Uribe | 1906-1908 | .193 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ludovico Uribe | 1910-1914 | .000 | 0 | 0 | 20 | 26 | 22 | 2.40 | 153 |
| 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 | 1910-1915 | .232 | 6 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Pandolfo Urive | 1906-1915 | .258 | 9 | 433 | 0 | 0 | 0 | 0.00 | 0 |
| Uriel Urrea | 1908-1913 | .000 | 0 | 0 | 28 | 40 | 3 | 3.86 | 179 |
| Buenaventura Urrutia | 1906-1915 | .309 | 13 | 752 | 0 | 0 | 0 | 0.00 | 0 |
| Federico Urtiaga | 1904-1915 | .000 | 0 | 0 | 235 | 174 | 1 | 2.54 | 1974 |
| 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 | 1912-1915 | .264 | 8 | 238 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Patolomaio Uta'i | 1915-1915 | .249 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Utting | 1902-1902 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
| Madis Uutma | 1914-1914 | .178 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
