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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 |
|---|---|---|---|---|---|---|---|---|---|
| Marvin Ubbels | 1958-1961 | .254 | 2 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Aarnoud Ubbens | 1952-1952 | .227 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Masaru Uchida | 1933-1933 | .333 | 6 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Munoto Uchida | 1951-1951 | .000 | 0 | 0 | 1 | 0 | 2 | 2.16 | 3 |
| Conroy Udard | 1928-1931 | .259 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ryosei Ueda | 1920-1920 | .467 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsunori Ueno | 1977-1978 | .308 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| José Ulerio | 1917-1920 | .212 | 21 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Eitor Ulman | 1917-1919 | .182 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Karolo Umaga | 1958-1958 | .000 | 0 | 0 | 2 | 3 | 5 | 7.32 | 16 |
| Khaled Umar | 1987-1988 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor Umlah | 1925-1925 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Shamim Umrani | 1931-1932 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Underwood | 1969-1969 | .000 | 0 | 0 | 0 | 2 | 0 | 5.60 | 11 |
| John Underwood | 1963-1965 | .272 | 9 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Underwood | 1919-1922 | .000 | 0 | 0 | 4 | 2 | 0 | 3.17 | 72 |
| Kevin Underwood | 1958-1964 | .000 | 0 | 0 | 4 | 1 | 0 | 7.06 | 32 |
| Michael Underwood | 1929-1929 | .529 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Willis Underwood | 1983-1989 | .000 | 0 | 0 | 4 | 5 | 1 | 7.82 | 35 |
| Arthur Unicume | 1921-1922 | .215 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Urbina | 1912-1912 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 7 |
| Guillermo Urbina | 1942-1943 | .000 | 0 | 0 | 4 | 3 | 2 | 5.02 | 90 |
| David Uribe | 1934-1934 | .364 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Uribe | 1921-1922 | .230 | 8 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Uribe | 1930-1930 | .179 | 6 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Uribe | 1916-1917 | .176 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Robinson Uribe | 1973-1973 | .200 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Urmston | 1936-1936 | .286 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Urmston Jr. | 1953-1959 | .266 | 11 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Armandek Uryniuk | 1975-1977 | .325 | 25 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tasuku Usui | 1962-1964 | .000 | 0 | 0 | 1 | 1 | 0 | 6.75 | 7 |
