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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tatsuya Uchi | 2011-2016 | 6 | 4 | .600 | 4.78 | 58 | 0 | 0 | 0 | 6 | 86.2 | 88 | 46 | 12 | 29 | 97 |
| Tatsuya Uchi | 2013-2020 | 7 | 6 | .538 | 3.87 | 103 | 2 | 0 | 0 | 4 | 186.0 | 183 | 80 | 26 | 47 | 176 |
| Koji Uehara | 1998-2015 | 18 | 15 | .545 | 3.44 | 46 | 37 | 3 | 0 | 5 | 290.0 | 253 | 111 | 44 | 85 | 250 |
| Jerry Ujdur | 1983-1986 | 6 | 16 | .273 | 5.40 | 47 | 29 | 1 | 0 | 0 | 233.1 | 246 | 140 | 34 | 88 | 117 |
| Jim Umbarger | 1974-1980 | 16 | 15 | .516 | 2.86 | 85 | 27 | 6 | 1 | 2 | 280.0 | 271 | 89 | 12 | 87 | 152 |
| Jim Umbricht | 1959-1963 | 5 | 4 | .556 | 2.65 | 64 | 16 | 0 | 0 | 6 | 146.0 | 125 | 43 | 7 | 50 | 119 |
| Pat Underwood | 1977-1984 | 67 | 39 | .632 | 2.98 | 138 | 121 | 30 | 8 | 1 | 922.2 | 811 | 306 | 72 | 206 | 600 |
| Tom Underwood | 1975-1995 | 113 | 82 | .579 | 3.31 | 292 | 259 | 31 | 11 | 3 | 1827.1 | 1563 | 673 | 145 | 643 | 1497 |
| Duane Underwood Jr | 2020-2021 | 0 | 1 | .000 | 3.22 | 26 | 0 | 0 | 0 | 1 | 36.1 | 32 | 13 | 6 | 17 | 33 |
| Dylan Unsworth | 2016-2017 | 6 | 7 | .462 | 4.36 | 26 | 15 | 0 | 0 | 0 | 117.2 | 135 | 57 | 15 | 29 | 97 |
| Cecil Upshaw | 1964-1965 | 4 | 6 | .400 | 3.02 | 44 | 0 | 0 | 0 | 17 | 47.2 | 43 | 16 | 2 | 10 | 27 |
| Ugueth Urbina | 1994-1995 | 6 | 17 | .261 | 3.32 | 105 | 0 | 0 | 0 | 40 | 171.0 | 111 | 63 | 16 | 104 | 244 |
| Jose M. Urena | 2014-2021 | 47 | 47 | .500 | 3.76 | 127 | 127 | 10 | 2 | 0 | 810.2 | 833 | 339 | 67 | 192 | 602 |
| Julio Urias | 2015-2016 | 4 | 13 | .235 | 5.25 | 28 | 28 | 1 | 0 | 0 | 142.1 | 158 | 83 | 28 | 54 | 137 |
| Jose Urquidy | 2017-2019 | 30 | 15 | .667 | 4.09 | 66 | 66 | 3 | 0 | 0 | 413.2 | 419 | 188 | 36 | 106 | 300 |
| John Urrea | 1975-1984 | 14 | 31 | .311 | 4.97 | 58 | 58 | 4 | 1 | 0 | 344.1 | 342 | 190 | 23 | 158 | 259 |
| Kazuhiko Ushijima | 1981-1993 | 23 | 29 | .442 | 3.66 | 284 | 3 | 0 | 0 | 82 | 454.1 | 380 | 185 | 38 | 214 | 513 |
| Tetsuya Utsumi | 2005-2009 | 2 | 5 | .286 | 3.04 | 14 | 13 | 0 | 0 | 0 | 74.0 | 66 | 25 | 4 | 13 | 63 |
| Naoyuki Uwasawa | 2020-2021 | 3 | 1 | .750 | 5.68 | 36 | 1 | 0 | 0 | 1 | 71.1 | 91 | 45 | 6 | 38 | 31 |
