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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Enmanuel Ulloa | 1998-1998 | 4 | 0 | 1.000 | 0.88 | 19 | 0 | 0 | 0 | 7 | 41.0 | 21 | 4 | 1 | 1 | 61 |
| Juan Ulloa | 2086-2086 | 4 | 2 | .667 | 2.70 | 9 | 5 | 0 | 0 | 0 | 40.0 | 31 | 12 | 3 | 12 | 38 |
| Duane Underwood | 2012-2016 | 1 | 1 | .500 | 2.33 | 9 | 8 | 0 | 0 | 0 | 19.1 | 14 | 5 | 1 | 7 | 21 |
| Brian Unger | 2027-2027 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 3 | 3.2 | 1 | 0 | 0 | 1 | 8 |
| Alfredo Unzue | 2012-2012 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 3.1 | 2 | 0 | 0 | 3 | 5 |
| Derek Upchurch | 2093-2093 | 3 | 0 | 1.000 | 1.50 | 5 | 1 | 0 | 0 | 0 | 12.0 | 10 | 2 | 2 | 1 | 17 |
| Dave Upton | 2058-2059 | 5 | 12 | .294 | 6.83 | 36 | 12 | 0 | 0 | 10 | 84.1 | 103 | 64 | 13 | 37 | 62 |
| Julio Urias | 2015-2015 | 0 | 0 | .000 | 0.00 | 2 | 2 | 0 | 0 | 0 | 3.0 | 2 | 0 | 0 | 1 | 5 |
| Mike Utterback | 2048-2048 | 0 | 0 | .000 | 1.80 | 4 | 0 | 0 | 0 | 0 | 5.0 | 2 | 1 | 1 | 0 | 6 |
