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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 |
|---|---|---|---|---|---|---|---|---|---|
| Aarnoud Ubbens | 1952-1952 | .223 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Masaru Uchida | 1935-1935 | .279 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Munoto Uchida | 1951-1952 | .000 | 0 | 0 | 6 | 4 | 14 | 4.15 | 64 |
| Ryosei Ueda | 1920-1924 | .254 | 13 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsunori Ueno | 1978-1978 | .300 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| José Ulerio | 1920-1922 | .278 | 16 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Alvaro Ulloa | 1935-1935 | .000 | 0 | 0 | 2 | 1 | 0 | 10.50 | 13 |
| Eitor Ulman | 1920-1920 | .252 | 2 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor Umlah | 1926-1926 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Underwood | 1911-1915 | .276 | 2 | 6 | 18 | 21 | 22 | 6.11 | 459 |
| Ed Underwood | 1970-1970 | .000 | 0 | 0 | 4 | 8 | 0 | 4.53 | 37 |
| Ken Underwood | 1919-1920 | .000 | 0 | 0 | 2 | 7 | 0 | 6.16 | 37 |
| Michael Underwood | 1930-1930 | .277 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Willis Underwood | 1989-1989 | .000 | 0 | 0 | 2 | 2 | 0 | 3.00 | 35 |
| Filip Urbanavage | 1976-1978 | .000 | 0 | 0 | 11 | 5 | 7 | 3.12 | 93 |
| Arturo Urbina | 1935-1935 | .228 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Urbina | 1911-1911 | .500 | 0 | 0 | 6 | 0 | 0 | 7.48 | 84 |
| Francisco Urbino | 1982-1983 | .000 | 0 | 0 | 8 | 7 | 1 | 7.77 | 35 |
| Francisco Uribe | 1923-1923 | .667 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| José Uribe | 1982-1982 | .000 | 0 | 0 | 1 | 0 | 0 | 8.24 | 17 |
| Juan Uribe | 1974-1974 | .360 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Uribe | 1930-1931 | .284 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Uribe | 1916-1916 | .159 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Achim Utpadel | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 3 | 2.19 | 20 |
| Vanyusha Uvadiev | 1984-1987 | .248 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
