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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeremy Ubersox | 2014-2018 | 29 | 27 | .518 | 4.01 | 123 | 77 | 0 | 0 | 2 | 530.1 | 474 | 236 | 43 | 318 | 468 |
| Daishin Uchida | 2017-2017 | 0 | 0 | .000 | 1.59 | 3 | 0 | 0 | 0 | 0 | 5.2 | 6 | 1 | 0 | 1 | 5 |
| Jose Ulloa | 2007-2009 | 20 | 7 | .741 | 2.94 | 92 | 21 | 0 | 0 | 15 | 229.1 | 177 | 75 | 25 | 70 | 279 |
| Ruben Ulloa | 2009-2009 | 6 | 7 | .462 | 4.73 | 15 | 15 | 0 | 0 | 0 | 85.2 | 86 | 45 | 16 | 39 | 79 |
| Mauro Ultra | 2005-2006 | 1 | 0 | 1.000 | 4.26 | 4 | 0 | 0 | 0 | 0 | 6.1 | 5 | 3 | 1 | 2 | 11 |
| Jim Ummel | 2010-2014 | 14 | 5 | .737 | 3.51 | 40 | 28 | 0 | 0 | 1 | 197.1 | 137 | 77 | 22 | 99 | 249 |
| Devin Underwood | 2012-2014 | 0 | 2 | .000 | 5.23 | 17 | 3 | 0 | 0 | 2 | 41.1 | 42 | 24 | 7 | 13 | 48 |
| Justin Underwood | 2009-2012 | 5 | 14 | .263 | 7.38 | 231 | 0 | 0 | 0 | 5 | 228.0 | 274 | 187 | 27 | 166 | 237 |
| Kyle Upton | 2000-2004 | 9 | 14 | .391 | 4.07 | 66 | 50 | 0 | 0 | 0 | 301.0 | 298 | 136 | 28 | 140 | 268 |
| Tony Urena | 2000-2014 | 13 | 13 | .500 | 3.13 | 181 | 6 | 0 | 0 | 31 | 215.2 | 179 | 75 | 20 | 78 | 206 |
| Roberto Urias | 2000-2000 | 4 | 4 | .500 | 3.50 | 11 | 11 | 0 | 0 | 0 | 69.1 | 71 | 27 | 5 | 15 | 70 |
| Willie Uribe | 2005-2011 | 25 | 36 | .410 | 4.67 | 108 | 88 | 1 | 1 | 1 | 491.0 | 459 | 255 | 49 | 297 | 561 |
| Manny Uset | 2001-2002 | 0 | 3 | .000 | 7.12 | 22 | 0 | 0 | 0 | 0 | 36.2 | 43 | 29 | 5 | 21 | 43 |
| Jerry Utsler | 2015-2018 | 17 | 9 | .654 | 3.01 | 36 | 36 | 1 | 0 | 0 | 206.1 | 185 | 69 | 19 | 59 | 171 |
