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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rich Uhlman | -2-2025 | 17 | 28 | .378 | 4.41 | 254 | 29 | 0 | 0 | 7 | 388.0 | 378 | 190 | 26 | 240 | 343 |
| Josh Ulloa | 0-3 | 11 | 10 | .524 | 3.99 | 153 | 0 | 0 | 0 | 4 | 277.2 | 247 | 123 | 25 | 124 | 264 |
| Silvério Umbreiro | 0-4 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 1.0 | 1 | 0 | 0 | 0 | 1 |
| Dan Underwood | 0-4 | 1 | 1 | .500 | 4.11 | 24 | 4 | 0 | 0 | 0 | 46.0 | 39 | 21 | 6 | 22 | 54 |
| Butch Upchurch | 2-2025 | 5 | 5 | .500 | 3.84 | 82 | 10 | 0 | 0 | 0 | 138.1 | 138 | 59 | 11 | 72 | 146 |
| Mike Urbain | 0-6 | 9 | 4 | .692 | 3.24 | 103 | 0 | 0 | 0 | 2 | 186.1 | 133 | 67 | 17 | 100 | 204 |
| Fradique Urcullu | 1-2026 | 11 | 8 | .579 | 3.24 | 29 | 28 | 0 | 0 | 0 | 169.1 | 124 | 61 | 17 | 61 | 165 |
| Jose Uriostegui | 0-4 | 0 | 1 | .000 | 4.91 | 3 | 0 | 0 | 0 | 0 | 3.2 | 3 | 2 | 0 | 2 | 2 |
