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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 |
|---|---|---|---|---|---|---|---|---|---|
| Stan Udall | 1994-2002 | .273 | 31 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Floyd Uhlman | 2023-2023 | .228 | 6 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Ukridge | 1995-1995 | .397 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Ulrich | 1971-1971 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Okakura Umaba | 2000-2001 | .000 | 0 | 0 | 7 | 12 | 0 | 4.24 | 148 |
| Bobby Underwood | 2004-2009 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Underwood | 2000-2000 | .368 | 4 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Underwood | 1980-1983 | .000 | 0 | 0 | 4 | 2 | 6 | 5.88 | 30 |
| Greg Underwood | 1978-1979 | .000 | 0 | 0 | 11 | 16 | 0 | 5.28 | 207 |
| Ron Underwood | 1991-1991 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Underwood | 1983-1989 | .254 | 9 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Underwood | 1992-1998 | .224 | 19 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Zach Underwood | 2002-2002 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Unworth | 2008-2013 | .333 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Uranga | 2008-2014 | .301 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Urbina | 1971-1971 | .000 | 0 | 0 | 6 | 9 | 1 | 3.99 | 89 |
| Francisco Urbina | 2004-2006 | .265 | 18 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Urbina | 2004-2008 | .261 | 28 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Robinson Urbina | 2009-2011 | .000 | 0 | 0 | 8 | 6 | 0 | 3.95 | 118 |
| Matthew Urdiano | 1981-1986 | .000 | 0 | 0 | 26 | 37 | 0 | 4.71 | 235 |
| Pedro Urdiano | 1983-1984 | .000 | 0 | 0 | 6 | 9 | 0 | 4.95 | 63 |
| Jorge Uribe | 2011-2011 | .295 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Uribe | 2003-2003 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pancho Urive | 1987-1987 | .318 | 4 | 48 | 0 | 0 | 0 | 45.00 | 0 |
| Will Urquhart | 1984-1985 | .000 | 0 | 0 | 15 | 18 | 2 | 5.10 | 270 |
| Jorge Urtiaga | 1982-1982 | .370 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Micheal Utterback | 2018-2018 | .264 | 19 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Tjakke Uytenhage | 1973-1973 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
