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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 |
|---|---|---|---|---|---|---|---|---|---|
| Raúl Ubillus | 1905-1905 | .000 | 0 | 0 | 0 | 1 | 0 | 2.79 | 2 |
| Masato Uchida | 1912-1913 | .221 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Akira Uchiyama | 1913-1913 | .242 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Uhlman | 1907-1909 | .000 | 0 | 0 | 22 | 8 | 0 | 3.05 | 243 |
| Felipe Ulibarri | 1904-1904 | .000 | 0 | 0 | 2 | 1 | 0 | 1.46 | 5 |
| Raúl Ulibarri | 1908-1911 | .000 | 0 | 0 | 30 | 49 | 0 | 3.90 | 478 |
| Manasa Ulla | 1907-1911 | .280 | 14 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Prudencio Ulloa | 1904-1905 | .000 | 0 | 0 | 2 | 1 | 0 | 2.35 | 36 |
| Kazuma Umemoto | 1912-1913 | .000 | 0 | 0 | 4 | 17 | 0 | 5.12 | 104 |
| Grant Underhill | 1904-1904 | .265 | 6 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Kai Underhill | 1910-1913 | .254 | 30 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin Upton | 1909-1910 | .292 | 14 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Upton | 1908-1913 | .216 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Alexej Urbanek | 1912-1913 | .000 | 0 | 0 | 7 | 4 | 10 | 4.21 | 57 |
| Eduardo Urbina | 1911-1913 | .244 | 7 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Polinario Urbina | 1906-1909 | .285 | 16 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Primitivo Urbina | 1904-1905 | .250 | 6 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Natanael Urenda | 1907-1910 | .350 | 26 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Noé Ureta | 1907-1909 | .214 | 21 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ureña | 1904-1905 | .000 | 0 | 0 | 11 | 13 | 0 | 3.27 | 198 |
| Felipe Uribe | 1905-1905 | .241 | 7 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Uribe | 1906-1910 | .271 | 8 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Uribe | 1907-1910 | .274 | 14 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Cecilio Uriostégui | 1907-1910 | .269 | 11 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Urquhart | 1906-1906 | .270 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Gaspar Urquidez | 1907-1907 | .265 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Uriel Urrea | 1904-1907 | .000 | 0 | 0 | 32 | 33 | 0 | 3.69 | 364 |
| Buenaventura Urrutia | 1909-1909 | .300 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Urrutia | 1904-1908 | .251 | 11 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Federico Urtiaga | 1904-1904 | .000 | 0 | 0 | 9 | 4 | 0 | 2.34 | 119 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Primitivo Urzúa | 1904-1908 | .275 | 38 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Boanerges Urías | 1907-1911 | .000 | 0 | 0 | 18 | 13 | 4 | 3.26 | 256 |
| Arso Uskokovic | 1913-1913 | .294 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Ladislao Utset | 1913-1913 | .000 | 0 | 0 | 0 | 2 | 2 | 2.00 | 13 |
| Jack Uttley | 1907-1907 | .254 | 7 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Madis Uutma | 1913-1913 | .275 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
