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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 | 2013-2017 | 1 | 10 | .091 | 3.77 | 36 | 34 | 0 | 0 | 1 | 162.1 | 146 | 68 | 13 | 93 | 166 |
| Daishin Uchida | 2017-2017 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 2 | 2.2 | 1 | 0 | 0 | 0 | 3 |
| Jo Uehara | 2023-2023 | 1 | 1 | .500 | 3.29 | 8 | 0 | 0 | 0 | 0 | 13.2 | 15 | 5 | 2 | 5 | 5 |
| Jose Ulloa | 2005-2006 | 5 | 9 | .357 | 4.19 | 41 | 8 | 0 | 0 | 3 | 86.0 | 84 | 40 | 7 | 33 | 86 |
| Ruben Ulloa | 2000-2003 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Dustin Ulrich | 2004-2006 | 3 | 8 | .273 | 4.98 | 79 | 1 | 0 | 0 | 2 | 108.1 | 130 | 60 | 17 | 42 | 104 |
| Mauro Ultra | 2005-2006 | 4 | 5 | .444 | 5.16 | 50 | 2 | 0 | 0 | 0 | 83.2 | 103 | 48 | 6 | 44 | 64 |
| Jim Ummel | 2007-2012 | 16 | 19 | .457 | 2.68 | 85 | 46 | 0 | 0 | 1 | 339.2 | 284 | 101 | 29 | 123 | 368 |
| Devin Underwood | 2009-2015 | 17 | 9 | .654 | 3.45 | 164 | 0 | 0 | 0 | 13 | 258.0 | 215 | 99 | 36 | 68 | 298 |
| Kyle Upton | 2000-2000 | 1 | 2 | .333 | 3.66 | 4 | 4 | 0 | 0 | 0 | 19.2 | 18 | 8 | 2 | 9 | 18 |
| D.J. Urbanek | 2022-2022 | 5 | 3 | .625 | 2.87 | 15 | 15 | 1 | 1 | 0 | 84.2 | 61 | 27 | 2 | 18 | 80 |
| Tony Urena | 2000-2000 | 0 | 0 | .000 | 0.00 | 5 | 0 | 0 | 0 | 4 | 6.0 | 2 | 0 | 0 | 1 | 5 |
| Carlos Uribe | 2000-2000 | 1 | 2 | .333 | 4.76 | 19 | 3 | 0 | 0 | 3 | 28.1 | 29 | 15 | 4 | 13 | 28 |
| Manny Uribe | 2015-2016 | 1 | 0 | 1.000 | 5.40 | 8 | 0 | 0 | 0 | 0 | 10.0 | 11 | 6 | 1 | 11 | 9 |
| Willie Uribe | 2003-2012 | 22 | 13 | .629 | 3.01 | 106 | 50 | 2 | 2 | 8 | 388.1 | 296 | 130 | 23 | 178 | 476 |
| Scott Uselton | 2002-2004 | 7 | 3 | .700 | 3.42 | 22 | 16 | 0 | 0 | 1 | 102.2 | 76 | 39 | 9 | 37 | 92 |
| Manny Uset | 2000-2002 | 9 | 3 | .750 | 2.18 | 24 | 21 | 0 | 0 | 0 | 103.0 | 79 | 25 | 9 | 25 | 99 |
| Jerry Utsler | 2015-2015 | 8 | 3 | .727 | 1.96 | 15 | 15 | 1 | 1 | 0 | 91.2 | 68 | 20 | 8 | 17 | 94 |
| Judson Utting | 2005-2005 | 2 | 1 | .667 | 2.61 | 9 | 0 | 0 | 0 | 1 | 20.2 | 21 | 6 | 1 | 3 | 13 |
