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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yoshitake Uchida | 2063-2070 | 49 | 66 | .426 | 4.34 | 171 | 152 | 8 | 3 | 1 | 1046.1 | 1093 | 505 | 84 | 337 | 803 |
| Koji Uehara | 2012-2012 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 3.0 | 3 | 0 | 0 | 0 | 4 |
| J.J. Ulanowski | 2052-2052 | 5 | 3 | .625 | 4.10 | 19 | 0 | 0 | 0 | 2 | 26.1 | 31 | 12 | 4 | 10 | 28 |
| Enmanuel Ulloa | 2000-2006 | 5 | 8 | .385 | 5.73 | 40 | 4 | 0 | 0 | 2 | 88.0 | 96 | 56 | 13 | 35 | 47 |
| Juan Ulloa | 2090-2098 | 37 | 32 | .536 | 4.22 | 179 | 92 | 7 | 1 | 3 | 776.1 | 851 | 364 | 69 | 239 | 591 |
| Tony Ulloa | 2064-2079 | 25 | 21 | .543 | 3.57 | 117 | 79 | 7 | 1 | 0 | 572.1 | 493 | 227 | 66 | 172 | 656 |
| Duane Underwood | 2024-2025 | 10 | 9 | .526 | 3.68 | 63 | 18 | 1 | 0 | 3 | 146.2 | 149 | 60 | 12 | 33 | 110 |
| Phil Underwood | 2061-2066 | 13 | 11 | .542 | 5.00 | 45 | 34 | 2 | 0 | 2 | 216.0 | 228 | 120 | 23 | 96 | 232 |
| Brian Unger | 2035-2042 | 19 | 12 | .613 | 3.02 | 133 | 5 | 0 | 0 | 34 | 188.0 | 177 | 63 | 15 | 76 | 200 |
| Tyler Unger | 2041-2049 | 5 | 10 | .333 | 5.68 | 104 | 5 | 0 | 0 | 11 | 122.0 | 119 | 77 | 27 | 44 | 141 |
| Nic Ungs | 2006-2008 | 16 | 17 | .485 | 4.78 | 63 | 49 | 3 | 0 | 2 | 290.0 | 329 | 154 | 38 | 100 | 173 |
| Riley Unroe | 2024-2024 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 1 |
| Jesus Unzueta | 2033-2036 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 1 | 1 |
| Dave Upton | 2076-2076 | 1 | 2 | .333 | 4.46 | 5 | 5 | 0 | 0 | 0 | 36.1 | 35 | 18 | 5 | 5 | 42 |
| Jose Urena | 2015-2015 | 6 | 1 | .857 | 2.66 | 11 | 11 | 1 | 1 | 0 | 67.2 | 65 | 20 | 4 | 19 | 41 |
| Julio Urias | 2015-2016 | 3 | 1 | .750 | 4.15 | 6 | 6 | 0 | 0 | 0 | 30.1 | 28 | 14 | 1 | 12 | 33 |
| Ryan Urness | 2051-2054 | 2 | 3 | .400 | 6.96 | 31 | 2 | 0 | 0 | 2 | 32.1 | 43 | 25 | 8 | 18 | 21 |
| Mike Utterback | 2057-2057 | 4 | 3 | .571 | 4.05 | 28 | 0 | 0 | 0 | 5 | 20.0 | 25 | 9 | 2 | 5 | 23 |
