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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 | 2018-2018 | 1 | 1 | .500 | 6.86 | 11 | 0 | 0 | 0 | 0 | 19.2 | 16 | 15 | 5 | 9 | 18 |
| Daishin Uchida | 2014-2017 | 3 | 0 | 1.000 | 1.60 | 13 | 3 | 1 | 1 | 4 | 39.1 | 20 | 7 | 2 | 7 | 23 |
| Akitoshi Uchiyama | 2006-2009 | 16 | 12 | .571 | 3.79 | 142 | 6 | 0 | 0 | 13 | 254.1 | 241 | 107 | 23 | 93 | 201 |
| Jose Ulloa | 2009-2012 | 3 | 1 | .750 | 3.74 | 22 | 9 | 0 | 0 | 0 | 74.2 | 79 | 31 | 7 | 30 | 80 |
| Ruben Ulloa | 2000-2009 | 22 | 11 | .667 | 3.29 | 48 | 43 | 1 | 1 | 0 | 276.2 | 230 | 101 | 25 | 65 | 230 |
| Jim Ummel | 2014-2014 | 1 | 5 | .167 | 5.50 | 12 | 7 | 0 | 0 | 0 | 54.0 | 52 | 33 | 15 | 26 | 70 |
| Brian Underwood | 2022-2024 | 26 | 18 | .591 | 3.24 | 56 | 56 | 5 | 1 | 0 | 363.1 | 348 | 131 | 20 | 85 | 231 |
| Kyle Upton | 2002-2006 | 9 | 9 | .500 | 4.66 | 89 | 24 | 0 | 0 | 1 | 203.0 | 212 | 105 | 25 | 100 | 175 |
| D.J. Urbanek | 2023-2024 | 25 | 13 | .658 | 3.12 | 59 | 59 | 0 | 0 | 0 | 355.1 | 307 | 123 | 28 | 77 | 265 |
| Tony Urena | 2002-2014 | 36 | 27 | .571 | 3.06 | 365 | 28 | 2 | 1 | 29 | 571.1 | 463 | 194 | 53 | 153 | 586 |
| Ricky Uriarte | 2000-2000 | 5 | 2 | .714 | 2.50 | 57 | 0 | 0 | 0 | 1 | 82.2 | 61 | 23 | 5 | 42 | 79 |
| Roberto Urias | 2000-2009 | 51 | 57 | .472 | 4.16 | 172 | 141 | 0 | 0 | 1 | 859.1 | 857 | 397 | 104 | 257 | 793 |
| Willie Uribe | 2006-2010 | 1 | 1 | .500 | 5.68 | 6 | 1 | 0 | 0 | 0 | 12.2 | 11 | 8 | 2 | 9 | 16 |
| Blake Urquhart | 2007-2007 | 0 | 1 | .000 | 16.96 | 20 | 0 | 0 | 0 | 1 | 26.0 | 46 | 49 | 3 | 40 | 14 |
| Jerry Utsler | 2017-2021 | 39 | 27 | .591 | 3.77 | 147 | 80 | 0 | 0 | 5 | 533.0 | 504 | 223 | 57 | 144 | 464 |
