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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jim Umbarger | 1976-1986 | .000 | 0 | 0 | 24 | 28 | 0 | 4.56 | 236 |
| Pat Underwood | 1979-1983 | .000 | 0 | 0 | 1 | 3 | 0 | 4.86 | 18 |
| Tom Underwood | 1976-1983 | .000 | 0 | 0 | 39 | 44 | 1 | 4.21 | 384 |
| Del Unser | 1976-1979 | .204 | 5 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Upshaw | 1979-1990 | .257 | 197 | 908 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Urbani | 1994-1996 | .000 | 0 | 0 | 7 | 5 | 1 | 4.66 | 228 |
| Ugueth Urbina | 1997-1997 | .000 | 0 | 0 | 6 | 10 | 0 | 5.04 | 140 |
| Jose Uribe | 1984-1992 | .220 | 6 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| John Urrea | 1977-1981 | .000 | 0 | 0 | 26 | 30 | 50 | 3.99 | 237 |
