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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 | 1994-1998 | .280 | 3 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Ugalde | 2008-2008 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Ulrich | 1971-1971 | .219 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Okakura Umaba | 1996-2001 | .000 | 0 | 0 | 11 | 22 | 0 | 5.54 | 191 |
| Dan Underwood | 1980-1983 | .000 | 0 | 0 | 3 | 3 | 3 | 3.38 | 30 |
| Ron Underwood | 1991-1991 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Underwood | 1990-1990 | .269 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Unworth | 2013-2015 | .250 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Uranga | 2012-2016 | .272 | 15 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| David Urbina | 1982-1982 | .216 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Urbina | 2001-2002 | .000 | 0 | 0 | 9 | 10 | 0 | 2.96 | 233 |
| Manny Urbina | 1971-1971 | .214 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Urbina | 2003-2009 | .246 | 30 | 125 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Urbina | 2012-2013 | .000 | 0 | 0 | 0 | 1 | 0 | 6.31 | 18 |
| Matthew Urdiano | 1983-1986 | .000 | 0 | 0 | 19 | 26 | 0 | 5.75 | 160 |
| Gerardo Uribe | 1982-1982 | .000 | 0 | 0 | 13 | 8 | 0 | 3.57 | 198 |
| Pancho Urive | 1987-1987 | .370 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Will Urquhart | 1984-1987 | .000 | 0 | 0 | 37 | 10 | 0 | 2.61 | 356 |
| Micheal Utterback | 2014-2016 | .280 | 34 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Tjakke Uytenhage | 1973-1973 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
