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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Okakura Umaba | 2-2002 | 11 | 22 | .333 | 5.54 | 49 | 49 | 2 | 0 | 0 | 256.2 | 309 | 158 | 19 | 143 | 191 |
| Dan Underwood | 0-0 | 3 | 3 | .500 | 3.38 | 41 | 0 | 0 | 0 | 3 | 58.2 | 56 | 22 | 2 | 24 | 30 |
| Jorge Urbina | 4-2014 | 9 | 10 | .474 | 2.96 | 32 | 32 | 0 | 0 | 0 | 221.2 | 190 | 73 | 19 | 65 | 233 |
| Rodrigo Urbina | 0-2017 | 0 | 1 | .000 | 6.31 | 20 | 2 | 0 | 0 | 0 | 25.2 | 37 | 18 | 6 | 15 | 18 |
| Matthew Urdiano | 2-0 | 19 | 26 | .422 | 5.75 | 63 | 61 | 9 | 0 | 0 | 356.2 | 433 | 228 | 19 | 159 | 160 |
| Gerardo Uribe | 0-0 | 13 | 8 | .619 | 3.57 | 29 | 29 | 3 | 0 | 0 | 186.1 | 193 | 74 | 11 | 72 | 198 |
| Will Urquhart | 10-1987 | 37 | 10 | .787 | 2.61 | 58 | 56 | 5 | 2 | 0 | 406.1 | 341 | 118 | 12 | 126 | 356 |
