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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dong-joo U | 2022-2022 | .277 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| António Uberuaga | 1983-1984 | .000 | 0 | 0 | 5 | 3 | 6 | 2.45 | 96 |
| Hirokichi Uemura | 2010-2012 | .277 | 28 | 133 | 0 | 0 | 0 | 0.00 | 0 |
| Seika Ueno | 1999-1999 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Burton Ukridge | 2009-2010 | .000 | 0 | 0 | 0 | 0 | 0 | 18.90 | 2 |
| Okakura Umaba | 1996-2000 | .000 | 0 | 0 | 9 | 15 | 0 | 2.86 | 231 |
| Chris Underwood | 1992-1992 | .305 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 1983-1983 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 1979-1984 | .000 | 0 | 0 | 3 | 2 | 2 | 3.34 | 16 |
| Don Underwood | 1975-1975 | .000 | 0 | 0 | 3 | 9 | 0 | 4.92 | 44 |
| Frank Underwood | 2004-2004 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Greg Underwood | 1976-1976 | .000 | 0 | 0 | 2 | 0 | 0 | 0.52 | 11 |
| Henry Underwood | 2021-2021 | .000 | 0 | 0 | 3 | 1 | 2 | 2.68 | 34 |
| Mike Underwood | 1978-1978 | .000 | 0 | 0 | 3 | 0 | 0 | 0.77 | 20 |
| Reed Underwood | 2006-2012 | .000 | 0 | 0 | 51 | 23 | 1 | 3.98 | 294 |
| Rob Underwood | 2006-2008 | .000 | 0 | 0 | 10 | 2 | 0 | 2.82 | 77 |
| Ron Underwood | 1986-1986 | .111 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Walt Underwood | 1987-1988 | .222 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Wes Underwood | 1999-2005 | .259 | 8 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Zach Underwood | 1996-1998 | .287 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Chester Unruh | 1971-1971 | .500 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Unworth | 1991-1991 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Unworth | 2008-2014 | .245 | 2 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Kent Upfold | 2021-2022 | .000 | 0 | 0 | 14 | 11 | 0 | 3.64 | 128 |
| Francisco Uranga | 2008-2010 | .285 | 11 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Urbina | 1971-1978 | .174 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| David Urbina | 1979-1983 | .233 | 1 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Urbina | 1995-1995 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Urbina | 1998-1998 | .164 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Urbina | 2001-2010 | .275 | 16 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Rodrigo Urbina | 2011-2018 | .000 | 0 | 0 | 4 | 2 | 1 | 4.38 | 46 |
| Matthew Urdiano | 1980-1981 | .000 | 0 | 0 | 7 | 3 | 1 | 3.94 | 70 |
| Pedro Urdiano | 1981-1981 | .000 | 0 | 0 | 17 | 10 | 0 | 3.76 | 128 |
| Eduardo Uribe | 1995-1995 | .188 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Uribe | 1995-1996 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Santiago Uribe | 1976-1976 | .000 | 0 | 0 | 2 | 6 | 8 | 5.01 | 14 |
| Pancho Urive | 1985-1986 | .422 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Will Urquhart | 1981-1982 | .000 | 0 | 0 | 11 | 22 | 1 | 5.30 | 187 |
| Cristo Urruticodez | 2009-2010 | .302 | 17 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| José Urtiaga | 1974-1975 | .289 | 2 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Usquiano | 1978-1984 | .292 | 2 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Tjakke Uytenhage | 1972-1973 | .095 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
