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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clark Ullom | 1970-1970 | 0 | 0 | .000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 3.1 | 6 | 5 | 1 | 2 | 3 |
| Jeffrey Ulrich | 1977-1979 | 0 | 0 | .000 | 18.90 | 3 | 0 | 0 | 0 | 0 | 3.1 | 8 | 7 | 1 | 6 | 0 |
| Arnold Umbach | 1961-1961 | 2 | 6 | .250 | 6.13 | 10 | 10 | 3 | 0 | 0 | 69.0 | 78 | 47 | 9 | 42 | 52 |
| Edward Upstone | 1971-1972 | 0 | 0 | .000 | 3.09 | 7 | 0 | 0 | 0 | 0 | 11.2 | 10 | 4 | 0 | 2 | 4 |
| Brian Urata | 1978-1980 | 2 | 2 | .500 | 5.01 | 33 | 0 | 0 | 0 | 1 | 55.2 | 57 | 31 | 6 | 33 | 37 |
| Thomas Urban | 1970-1971 | 6 | 9 | .400 | 3.24 | 22 | 21 | 0 | 0 | 0 | 125.0 | 125 | 45 | 7 | 63 | 75 |
| John Urrea | 1973-1973 | 4 | 4 | .500 | 4.37 | 14 | 14 | 0 | 0 | 0 | 80.1 | 86 | 39 | 12 | 25 | 37 |
| Angelo Urzua | 1973-1973 | 1 | 1 | .500 | 2.45 | 4 | 0 | 0 | 0 | 0 | 3.2 | 4 | 1 | 0 | 2 | 3 |
| Rico Utrera | 1974-1976 | 6 | 6 | .500 | 6.17 | 48 | 0 | 0 | 0 | 2 | 70.0 | 91 | 48 | 8 | 49 | 21 |
