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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Kyung-chor U | 1982-1984 | .260 | 20 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Mick Ubaya | 2055-2055 | .359 | 7 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Yushiro Uchida | 1986-1986 | .000 | 0 | 0 | 2 | 2 | 27 | 1.14 | 22 |
| Jiro Uchiyama | 2019-2019 | .303 | 5 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Tadasuke Uchiyama | 1991-1991 | .300 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Venric Udaka | 2053-2054 | .323 | 22 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Kanko Ueno | 1982-1983 | .000 | 0 | 0 | 5 | 4 | 15 | 3.60 | 30 |
| Casper Uitz | 2039-2040 | .241 | 18 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Andre Ulleri | 2043-2044 | .000 | 0 | 0 | 6 | 5 | 0 | 2.95 | 168 |
| Tom Ulrich | 1991-1992 | .291 | 2 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| James Ulusu | 2036-2037 | .000 | 0 | 0 | 9 | 5 | 0 | 3.97 | 65 |
| Rich Umanzor | 1995-1998 | .294 | 10 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Genjo Umeda | 2022-2033 | .315 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Zackary Umemoto | 2056-2056 | .000 | 0 | 0 | 7 | 7 | 0 | 3.73 | 124 |
| Robby Umlauf | 2027-2027 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 8 |
| Charone Umrani | 2056-2059 | .207 | 23 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Underberg | 2034-2035 | .184 | 2 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Underdown | 1981-1981 | .000 | 0 | 0 | 9 | 9 | 0 | 4.01 | 73 |
| Clint Underwood | 1985-1986 | .321 | 6 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Timmy Ungureanu | 2036-2040 | .255 | 8 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Terrence Unkovsky | 2045-2047 | .193 | 2 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Upton | 2015-2016 | .296 | 9 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Urban | 2018-2021 | .222 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Brendon Urbanek | 2037-2038 | .267 | 7 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Jaden Urcuyo | 2039-2040 | .297 | 5 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Uribe | 2002-2004 | .000 | 0 | 0 | 18 | 10 | 0 | 2.88 | 211 |
| Orpheus Uribe | 2039-2039 | .000 | 0 | 0 | 1 | 6 | 2 | 9.06 | 35 |
| Jamie Urmson | 2003-2006 | .249 | 7 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Uro | 1981-1983 | .000 | 0 | 0 | 4 | 4 | 13 | 4.48 | 95 |
| José Urra | 1978-1992 | .264 | 1 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| El-Fatih Usiku | 2007-2008 | .299 | 2 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Jamie Uva | 2021-2022 | .326 | 16 | 67 | 0 | 0 | 0 | 0.00 | 0 |
