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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 | 1989-1993 | .236 | 7 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Mick Ubaya | 2057-2060 | .287 | 3 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Yushiro Uchida | 1988-1988 | .000 | 0 | 0 | 6 | 3 | 26 | 1.62 | 83 |
| Jiro Uchiyama | 2020-2020 | .310 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Keita Uchiyama | 1978-1979 | .232 | 8 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Tadasuke Uchiyama | 1992-2001 | .321 | 18 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Venric Udaka | 2057-2060 | .293 | 22 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Kanko Ueno | 1985-1988 | .000 | 0 | 0 | 5 | 2 | 1 | 3.08 | 33 |
| Casper Uitz | 2043-2050 | .230 | 38 | 171 | 0 | 0 | 0 | 0.00 | 0 |
| Andre Ulleri | 2045-2059 | .000 | 0 | 0 | 11 | 9 | 0 | 3.73 | 177 |
| Andy Ulloa | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Ulrich | 1994-1994 | .303 | 3 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| James Ulusu | 2038-2047 | .000 | 0 | 0 | 10 | 8 | 0 | 3.47 | 86 |
| Rich Umanzor | 1998-2002 | .249 | 52 | 192 | 0 | 0 | 0 | 0.00 | 0 |
| Genjo Umeda | 2023-2032 | .255 | 16 | 182 | 0 | 0 | 0 | 0.00 | 0 |
| Zackary Umemoto | 2058-2058 | .000 | 0 | 0 | 1 | 4 | 1 | 5.65 | 74 |
| Robby Umlauf | 2028-2039 | .000 | 0 | 0 | 15 | 9 | 1 | 3.74 | 174 |
| Tommy Underberg | 2037-2039 | .286 | 5 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Underdown | 1978-1985 | .000 | 0 | 0 | 17 | 39 | 0 | 6.56 | 196 |
| Clint Underwood | 1987-1988 | .303 | 17 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Timmy Ungureanu | 2038-2050 | .240 | 19 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Terrence Unkovsky | 2049-2052 | .154 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Upton | 2018-2025 | .243 | 11 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Urban | 2024-2027 | .259 | 10 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Brendon Urbanek | 2039-2048 | .257 | 30 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Jaden Urcuyo | 2042-2048 | .321 | 4 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ureste | 1992-2014 | .000 | 0 | 0 | 3 | 7 | 24 | 3.84 | 95 |
| Edwin Uribe | 2005-2010 | .000 | 0 | 0 | 13 | 9 | 0 | 3.21 | 152 |
| Jamie Urmson | 2008-2026 | .303 | 38 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Uro | 1984-1988 | .000 | 0 | 0 | 2 | 5 | 36 | 2.32 | 123 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Urra | 1981-1993 | .301 | 2 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Urrego | 1982-1987 | .167 | 0 | 0 | 35 | 29 | 0 | 4.30 | 253 |
| Aníbal Urruticodez | 1978-1980 | .260 | 28 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| El-Fatih Usiku | 2010-2019 | .284 | 64 | 342 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Utley | 1978-1978 | .277 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jamie Uva | 2024-2028 | .270 | 11 | 42 | 0 | 0 | 0 | 0.00 | 0 |
