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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 | 0-2020 | 0 | 0 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 2.2 | 1 | 2 | 0 | 3 | 4 |
| Josh Ulloa | 0-2022 | 3 | 4 | .429 | 4.33 | 23 | 5 | 0 | 0 | 4 | 52.0 | 54 | 25 | 2 | 7 | 36 |
| Sung-jae Um | 0-0 | 3 | 1 | .750 | 5.75 | 39 | 0 | 0 | 0 | 4 | 40.2 | 46 | 26 | 5 | 16 | 33 |
| Yellel Umar | -1-2024 | 0 | 2 | .000 | 7.20 | 16 | 0 | 0 | 0 | 1 | 25.0 | 33 | 20 | 4 | 15 | 7 |
| Silvério Umbreiro | 0-2023 | 0 | 1 | .000 | 6.00 | 2 | 1 | 0 | 0 | 0 | 6.0 | 9 | 4 | 0 | 1 | 3 |
| Dan Underwood | 0-2025 | 10 | 4 | .714 | 4.01 | 23 | 16 | 0 | 0 | 1 | 94.1 | 93 | 42 | 7 | 20 | 73 |
| Mike Urbain | 0-2021 | 6 | 2 | .750 | 3.15 | 42 | 7 | 0 | 0 | 14 | 80.0 | 59 | 28 | 8 | 21 | 90 |
| Joel Urban | 1-2026 | 12 | 8 | .600 | 3.13 | 78 | 0 | 0 | 0 | 13 | 100.2 | 79 | 35 | 6 | 44 | 111 |
| Mike Urbanek | 0-11 | 0 | 2 | .000 | 8.00 | 16 | 0 | 0 | 0 | 1 | 18.0 | 26 | 16 | 6 | 12 | 19 |
| Antonio Urbina | 0-2026 | 0 | 0 | .000 | 9.00 | 4 | 0 | 0 | 0 | 0 | 2.0 | 3 | 2 | 0 | 0 | 2 |
| Fradique Urcullu | 0-2022 | 1 | 4 | .200 | 3.18 | 13 | 8 | 0 | 0 | 0 | 51.0 | 44 | 18 | 3 | 20 | 69 |
| Edwin Urena | 0-2025 | 4 | 1 | .800 | 4.44 | 31 | 0 | 0 | 0 | 2 | 50.2 | 50 | 25 | 8 | 18 | 37 |
| Jose Uriostegui | 0-2025 | 8 | 4 | .667 | 3.41 | 55 | 0 | 0 | 0 | 2 | 89.2 | 76 | 34 | 7 | 37 | 83 |
| Tokio Ushijima | 0-2024 | 1 | 1 | .500 | 3.38 | 26 | 0 | 0 | 0 | 0 | 26.2 | 29 | 10 | 5 | 12 | 34 |
