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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shikato Ueda | 1977-1981 | 22 | 12 | .647 | 3.39 | 46 | 46 | 2 | 0 | 0 | 326.1 | 243 | 123 | 38 | 87 | 225 |
| Robert Ulrich | 1970-1975 | 14 | 13 | .519 | 4.46 | 141 | 18 | 0 | 0 | 0 | 365.0 | 340 | 181 | 43 | 209 | 283 |
| Arnold Umbach | 1961-1961 | 1 | 1 | .500 | 1.80 | 3 | 1 | 0 | 0 | 1 | 10.0 | 7 | 2 | 0 | 5 | 6 |
| Jim Umbarger | 1974-1981 | 28 | 17 | .622 | 3.09 | 82 | 61 | 1 | 1 | 11 | 420.0 | 368 | 144 | 37 | 124 | 225 |
| Jim Umbricht | 1959-1959 | 14 | 8 | .636 | 2.78 | 47 | 5 | 4 | 0 | 12 | 136.0 | 115 | 42 | 8 | 43 | 119 |
| Tom Underwood | 1972-1974 | 19 | 18 | .514 | 3.45 | 49 | 49 | 6 | 0 | 0 | 321.1 | 249 | 123 | 23 | 167 | 270 |
| Michael Ungs | 1979-1980 | 5 | 2 | .714 | 4.03 | 58 | 0 | 0 | 0 | 9 | 114.0 | 107 | 51 | 15 | 58 | 50 |
| Al Unser | 1946-1949 | 6 | 6 | .500 | 4.96 | 19 | 10 | 3 | 0 | 0 | 98.0 | 114 | 54 | 6 | 54 | 57 |
| John Upham | 1965-1968 | 0 | 2 | .000 | 5.44 | 21 | 0 | 0 | 0 | 4 | 43.0 | 50 | 26 | 4 | 28 | 38 |
| Bill Upton | 1954-1954 | 0 | 3 | .000 | 2.14 | 5 | 1 | 0 | 0 | 1 | 13.24 | 11 | 5 | 0 | 7 | 7 |
| Angelo Urzua | 1974-1978 | 3 | 2 | .600 | 4.47 | 31 | 0 | 0 | 0 | 6 | 44.1 | 36 | 22 | 8 | 18 | 37 |
