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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Al Unser | 1956-1961 | 1 | 1 | .500 | 5.48 | 4 | 3 | 0 | 0 | 0 | 23.0 | 30 | 14 | 2 | 14 | 16 |
| Mark Unsoeld | 1977-1977 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Michael Untisz | 1981-1981 | 1 | 1 | .500 | 2.84 | 4 | 0 | 0 | 0 | 0 | 6.1 | 5 | 2 | 0 | 10 | 3 |
| Edward Upstone | 1970-1971 | 1 | 0 | 1.000 | 3.33 | 13 | 0 | 0 | 0 | 0 | 24.1 | 23 | 9 | 1 | 12 | 15 |
| Brian Urata | 1979-1979 | 2 | 6 | .250 | 6.11 | 11 | 10 | 0 | 0 | 0 | 53.0 | 70 | 36 | 7 | 33 | 17 |
| Thomas Urban | 1970-1972 | 10 | 16 | .385 | 4.47 | 43 | 41 | 1 | 0 | 0 | 253.2 | 252 | 126 | 29 | 146 | 145 |
| Angelo Urzua | 1974-1975 | 6 | 4 | .600 | 3.59 | 14 | 13 | 2 | 0 | 0 | 97.2 | 82 | 39 | 8 | 36 | 68 |
