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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Masami Uchida | 2047-2052 | 4 | 5 | .444 | 3.82 | 74 | 0 | 0 | 0 | 7 | 148.1 | 140 | 63 | 19 | 30 | 126 |
| Koji Uehara | 2010-2010 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 2 | 0 | 0 | 0 | 1 |
| J.J. Ulanowski | 2044-2057 | 18 | 15 | .545 | 3.04 | 151 | 12 | 0 | 0 | 29 | 308.1 | 263 | 104 | 21 | 127 | 289 |
| Jose Ulibarri | 2070-2071 | 13 | 18 | .419 | 4.01 | 36 | 36 | 1 | 0 | 0 | 233.2 | 262 | 104 | 19 | 75 | 213 |
| Enmanuel Ulloa | 2003-2003 | 0 | 0 | .000 | 11.05 | 3 | 0 | 0 | 0 | 0 | 7.1 | 14 | 9 | 2 | 2 | 5 |
| Tony Ulloa | 2077-2077 | 2 | 3 | .400 | 4.40 | 5 | 5 | 0 | 0 | 0 | 28.2 | 31 | 14 | 5 | 4 | 36 |
| Duane Underwood | 2017-2023 | 24 | 23 | .511 | 3.46 | 68 | 68 | 2 | 0 | 0 | 431.1 | 380 | 166 | 22 | 138 | 325 |
| Phil Underwood | 2067-2068 | 3 | 1 | .750 | 3.33 | 8 | 6 | 0 | 0 | 0 | 46.0 | 38 | 17 | 3 | 19 | 49 |
| Dave Upton | 2061-2062 | 8 | 5 | .615 | 2.84 | 15 | 15 | 6 | 1 | 0 | 111.0 | 88 | 35 | 6 | 25 | 118 |
| Danny Urista | 2097-2098 | 1 | 3 | .250 | 2.05 | 14 | 2 | 0 | 0 | 5 | 26.1 | 16 | 6 | 1 | 18 | 38 |
| Mike Utterback | 2055-2055 | 5 | 3 | .625 | 2.25 | 45 | 0 | 0 | 0 | 11 | 56.0 | 42 | 14 | 6 | 23 | 75 |
| Pat Utterback | 2097-2098 | 11 | 2 | .846 | 2.98 | 89 | 0 | 0 | 0 | 29 | 130.0 | 110 | 43 | 14 | 35 | 145 |
