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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 | 2021-2021 | .242 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| António Uberuaga | 1984-1984 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Hirokichi Uemura | 2010-2010 | .240 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Ugalde | 2001-2001 | .354 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Ukridge | 1989-1989 | .321 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 1982-1985 | .236 | 0 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 1981-1981 | .000 | 0 | 0 | 3 | 7 | 8 | 5.42 | 35 |
| Don Underwood | 1976-1976 | .000 | 0 | 0 | 12 | 9 | 0 | 2.27 | 113 |
| Greg Underwood | 1976-1976 | .000 | 0 | 0 | 2 | 2 | 0 | 5.40 | 28 |
| Henry Underwood | 2020-2021 | .000 | 0 | 0 | 5 | 2 | 3 | 4.22 | 50 |
| Mike Underwood | 1977-1978 | .000 | 0 | 0 | 17 | 10 | 0 | 3.04 | 165 |
| Reed Underwood | 2007-2010 | .000 | 0 | 0 | 8 | 9 | 1 | 3.80 | 66 |
| Rob Underwood | 2006-2008 | .000 | 0 | 0 | 20 | 16 | 0 | 3.10 | 214 |
| Ron Underwood | 1986-1992 | .275 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Underwood | 1983-1983 | .336 | 3 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Wes Underwood | 1999-1999 | .293 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Zach Underwood | 1996-1996 | .377 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Unworth | 1992-1995 | .264 | 1 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Unworth | 2010-2012 | .321 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Kent Upfold | 2021-2021 | .000 | 0 | 0 | 10 | 4 | 0 | 3.12 | 86 |
| Alberto Urbina | 1974-1977 | .143 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Urbina | 1971-1971 | .000 | 0 | 0 | 1 | 0 | 0 | 1.00 | 4 |
| David Urbina | 1980-1983 | .198 | 0 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Urbina | 1982-1982 | .242 | 8 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Robinson Urbina | 2010-2010 | .000 | 0 | 0 | 5 | 5 | 11 | 2.25 | 37 |
| Rodrigo Urbina | 2011-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 22.50 | 1 |
| Fernando Uribe | 1986-1987 | .250 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Gerardo Uribe | 1980-1981 | .000 | 0 | 0 | 5 | 4 | 4 | 4.19 | 55 |
| Jorge Uribe | 2003-2004 | .275 | 26 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Uribe | 1996-1998 | .303 | 3 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Santiago Uribe | 1977-1977 | .000 | 0 | 0 | 1 | 0 | 4 | 0.00 | 4 |
| Will Urquhart | 1981-1983 | .000 | 0 | 0 | 5 | 6 | 0 | 4.08 | 74 |
| Cristo Urruticodez | 2009-2009 | .267 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| José Urtiaga | 1975-1975 | .320 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Usquiano | 1978-1983 | .244 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Tjakke Uytenhage | 1972-1973 | .243 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
