Jimmy Uchrinscko 1926-1926 Bob Uecker 1962-1967 Koji Uehara 2009-2009 Dan Uggla 2006-2009 Luis Ugueto 2002-2003 Frenchy Uhalt 1934-1934 Bob Uhl 1938-1940 Ted Uhlaender 1965-1972 George Uhle 1919-1936 Maury Uhler 1914-1914 Charlie Uhlir 1934-1934 Jerry Ujdur 1980-1984 Mike Ulisney 1945-1945
| Scott Ullger 1983-1983 Sandy Ullrich 1944-1945 Dutch Ulrich 1925-1927 Arnold Umbach 1964-1966 Jim Umbarger 1975-1978 Jim Umbricht 1959-1963 Tom Umphlett 1953-1955 Willie Underhill 1927-1928 Pat Underwood 1979-1983 Tom Underwood 1974-1984 Bob Unglaub 1904-1910 Tim Unroe 1995-2000 Al Unser 1942-1945
| Del Unser 1968-1982 Woody Upchurch 1935-1936 Bill Upham 1918-1918 John Upham 1967-1968 Jerry Upp 1909-1909 Dixie Upright 1953-1953 Cecil Upshaw 1966-1975 Willie Upshaw 1978-1988 B.J. Upton 2004-2009 Bill Upton 1954-1954 Justin Upton 2007-2009 Tom Upton 1950-1952 Jack Urban 1957-1959
| Luke Urban 1927-1928 Tom Urbani 1993-1996 Billy Urbanski 1931-1937 Ugueth Urbina 1995-2005 Lino Urdaneta 2004-2007 Jose Uribe 1984-1993 Juan Uribe 2001-2009 John Urrea 1977-1981 Lon Ury 1903-1903 Bob Usher 1946-1957 Dutch Ussat 1925-1927 Chase Utley 2003-2009
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