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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Norio Uchiyama | 2047-2050 | 10 | 5 | .667 | 2.69 | 30 | 15 | 0 | 0 | 1 | 133.2 | 89 | 40 | 18 | 19 | 173 |
| Leoncio Ulibarri | 2023-2028 | 21 | 19 | .525 | 3.13 | 71 | 50 | 2 | 1 | 6 | 388.1 | 329 | 135 | 12 | 135 | 410 |
| Conrado Umbelino | 2047-2047 | 3 | 4 | .429 | 3.02 | 18 | 13 | 0 | 0 | 0 | 83.1 | 56 | 28 | 9 | 52 | 69 |
| Shawn Umble | 2041-2042 | 13 | 8 | .619 | 3.88 | 34 | 27 | 0 | 0 | 1 | 171.2 | 156 | 74 | 15 | 67 | 179 |
| Francisco Ureña | 2038-2038 | 1 | 1 | .500 | 3.24 | 12 | 0 | 0 | 0 | 1 | 25.0 | 19 | 9 | 2 | 9 | 23 |
| António Uribe | 2020-2020 | 12 | 4 | .750 | 1.99 | 23 | 23 | 0 | 0 | 0 | 154.0 | 111 | 34 | 8 | 39 | 225 |
| Ignacio Uribe | 2033-2035 | 19 | 17 | .528 | 2.77 | 52 | 52 | 3 | 1 | 0 | 328.0 | 255 | 101 | 19 | 97 | 375 |
