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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bob Uecker | 1956-1958 | .325 | 34 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Clark Ullom | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 3 |
| Jeffrey Ulrich | 1977-1979 | .091 | 0 | 0 | 0 | 0 | 0 | 18.90 | 0 |
| Arnold Umbach | 1961-1961 | .043 | 0 | 0 | 2 | 6 | 0 | 6.13 | 52 |
| Harrold Underwood | 1971-1971 | .276 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Unsoeld | 1974-1977 | .304 | 20 | 138 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Upstone | 1971-1972 | .000 | 0 | 0 | 0 | 0 | 0 | 3.09 | 4 |
| Brian Urata | 1978-1980 | .000 | 0 | 0 | 2 | 2 | 1 | 5.01 | 37 |
| Thomas Urban | 1970-1971 | .000 | 0 | 0 | 6 | 9 | 0 | 3.24 | 75 |
| Joe Urbanovich | 1969-1969 | .219 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Urias | 1979-1980 | .249 | 1 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Uribe | 1971-1974 | .292 | 20 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| John Urrea | 1973-1973 | .000 | 0 | 0 | 4 | 4 | 0 | 4.37 | 37 |
| Angelo Urzua | 1973-1973 | .000 | 0 | 0 | 1 | 1 | 0 | 2.45 | 3 |
| Rico Utrera | 1974-1976 | .000 | 0 | 0 | 6 | 6 | 2 | 6.17 | 21 |
| John Uvodich | 1980-1981 | .143 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
