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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daishin Uchida | 2008-2016 | 81 | 80 | .503 | 3.95 | 337 | 196 | 10 | 2 | 12 | 1403.0 | 1377 | 615 | 141 | 336 | 938 |
| Jose Ulloa | 2009-2014 | 23 | 31 | .426 | 4.60 | 119 | 75 | 2 | 1 | 0 | 491.0 | 490 | 251 | 73 | 166 | 436 |
| Ruben Ulloa | 2000-2008 | 50 | 106 | .321 | 5.33 | 214 | 202 | 7 | 4 | 0 | 1163.2 | 1375 | 689 | 164 | 425 | 712 |
| Brian Underwood | 2023-2025 | 12 | 10 | .545 | 4.71 | 35 | 25 | 0 | 0 | 2 | 170.0 | 175 | 89 | 13 | 69 | 107 |
| Tony Urena | 2005-2013 | 15 | 15 | .500 | 4.34 | 222 | 7 | 0 | 0 | 9 | 298.1 | 297 | 144 | 35 | 136 | 202 |
| Roberto Urias | 2002-2009 | 32 | 46 | .410 | 4.62 | 122 | 111 | 2 | 2 | 2 | 644.2 | 679 | 331 | 93 | 203 | 418 |
| Willie Uribe | 2006-2006 | 1 | 0 | 1.000 | 6.86 | 7 | 2 | 0 | 0 | 0 | 21.0 | 22 | 16 | 1 | 27 | 20 |
