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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 | 0-2022 | 2 | 6 | .250 | 3.78 | 14 | 14 | 0 | 0 | 0 | 64.1 | 67 | 27 | 2 | 25 | 58 |
| Josh Ulloa | 0-2023 | 8 | 7 | .533 | 4.27 | 21 | 21 | 1 | 0 | 0 | 109.2 | 104 | 52 | 6 | 33 | 85 |
| Yellel Umar | 0-6 | 3 | 1 | .750 | 6.92 | 20 | 0 | 0 | 0 | 1 | 26.0 | 35 | 20 | 3 | 20 | 11 |
| Silvério Umbreiro | 0-2026 | 1 | 1 | .500 | 3.49 | 16 | 1 | 0 | 0 | 0 | 28.1 | 28 | 11 | 1 | 11 | 28 |
| Dan Underwood | 1-2026 | 3 | 2 | .600 | 4.50 | 15 | 7 | 0 | 0 | 3 | 36.0 | 40 | 18 | 2 | 14 | 26 |
| Mike Urbain | 0-2025 | 0 | 2 | .000 | 1.69 | 2 | 2 | 0 | 0 | 0 | 10.2 | 12 | 2 | 0 | 2 | 11 |
| Joel Urban | -1-5 | 3 | 2 | .600 | 3.83 | 31 | 0 | 0 | 0 | 0 | 42.1 | 29 | 18 | 8 | 27 | 45 |
| Antonio Urbina | 0-2026 | 3 | 4 | .429 | 4.50 | 12 | 12 | 0 | 0 | 0 | 60.0 | 70 | 30 | 4 | 18 | 49 |
| Fradique Urcullu | 0-2023 | 3 | 2 | .600 | 2.70 | 28 | 14 | 0 | 0 | 2 | 96.2 | 79 | 29 | 7 | 33 | 105 |
| Edwin Urena | 0-2023 | 7 | 5 | .583 | 5.38 | 61 | 0 | 0 | 0 | 2 | 85.1 | 100 | 51 | 8 | 47 | 68 |
| Jose Uriostegui | 0-2026 | 2 | 1 | .667 | 3.83 | 16 | 5 | 0 | 0 | 0 | 40.0 | 39 | 17 | 7 | 11 | 31 |
| Tokio Ushijima | 0-2023 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 3 | 1 | 1 | 2 | 3 |
