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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 | 2017-2017 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 |
| Akitoshi Uchiyama | 2009-2009 | 0 | 1 | .000 | 4.34 | 4 | 4 | 0 | 0 | 0 | 18.2 | 20 | 9 | 2 | 2 | 22 |
| Jo Uehara | 2023-2024 | 4 | 10 | .286 | 6.30 | 74 | 9 | 0 | 0 | 12 | 135.2 | 157 | 95 | 48 | 66 | 65 |
| David Ugarte | 2003-2005 | 1 | 1 | .500 | 7.27 | 6 | 0 | 0 | 0 | 1 | 8.2 | 16 | 7 | 0 | 3 | 0 |
| Jose Ulloa | 2005-2005 | 2 | 0 | 1.000 | 3.86 | 8 | 0 | 0 | 0 | 0 | 11.2 | 12 | 5 | 2 | 5 | 13 |
| Ruben Ulloa | 2010-2010 | 0 | 0 | .000 | 9.00 | 1 | 1 | 0 | 0 | 0 | 4.0 | 5 | 4 | 2 | 2 | 3 |
| Dustin Ulrich | 2003-2004 | 7 | 6 | .538 | 4.83 | 38 | 14 | 1 | 0 | 0 | 110.0 | 137 | 59 | 10 | 39 | 73 |
| Mauro Ultra | 2005-2005 | 0 | 1 | .000 | 3.38 | 4 | 0 | 0 | 0 | 0 | 5.1 | 6 | 2 | 0 | 4 | 7 |
| Jim Ummel | 2007-2011 | 14 | 2 | .875 | 2.80 | 45 | 27 | 0 | 0 | 0 | 161.0 | 126 | 50 | 8 | 46 | 159 |
| Brian Underwood | 2020-2021 | 23 | 2 | .920 | 2.12 | 36 | 36 | 4 | 2 | 0 | 259.0 | 191 | 61 | 30 | 46 | 199 |
| Devin Underwood | 2009-2011 | 2 | 4 | .333 | 3.80 | 14 | 11 | 0 | 0 | 0 | 64.0 | 55 | 27 | 4 | 17 | 50 |
| Justin Underwood | 2006-2008 | 7 | 6 | .538 | 4.04 | 79 | 0 | 0 | 0 | 29 | 78.0 | 67 | 35 | 7 | 37 | 108 |
| D.J. Urbanek | 2020-2021 | 15 | 9 | .625 | 3.67 | 37 | 36 | 1 | 1 | 0 | 203.1 | 176 | 83 | 40 | 49 | 143 |
| Dennis Urch | 2008-2011 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 1 | 0 | 0 | 0 | 0 |
| Manny Uribe | 2015-2016 | 6 | 7 | .462 | 6.70 | 56 | 2 | 0 | 0 | 2 | 83.1 | 89 | 62 | 20 | 56 | 68 |
| Willie Uribe | 2002-2003 | 8 | 3 | .727 | 3.21 | 22 | 12 | 0 | 0 | 3 | 81.1 | 66 | 29 | 8 | 15 | 86 |
| Scott Uselton | 2002-2003 | 8 | 10 | .444 | 4.31 | 26 | 26 | 5 | 2 | 0 | 152.1 | 175 | 73 | 12 | 46 | 110 |
| Jerry Utsler | 2018-2018 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 2 |
| Judson Utting | 2003-2005 | 11 | 6 | .647 | 4.53 | 79 | 1 | 0 | 0 | 2 | 113.1 | 117 | 57 | 9 | 45 | 105 |
