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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 |
|---|---|---|---|---|---|---|---|---|---|
| Robun Uchida | 2020-2037 | .000 | 0 | 0 | 93 | 91 | 348 | 3.64 | 1864 |
| Jimmy Uchrinscko | 1926-1926 | .000 | 0 | 0 | 0 | 0 | 0 | 10.12 | 0 |
| Bob Uecker | 1962-1967 | .200 | 14 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Koji Uehara | 2009-2018 | .000 | 0 | 0 | 19 | 23 | 93 | 2.59 | 536 |
| Luis Ugarte | 2044-2044 | .000 | 0 | 0 | 0 | 0 | 0 | 6.23 | 12 |
| Dan Uggla | 2006-2015 | .241 | 235 | 706 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ugueto | 2002-2003 | .214 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Frenchy Uhalt | 1934-1934 | .242 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Uhl | 1938-1940 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ted Uhlaender | 1965-1972 | .263 | 36 | 285 | 0 | 0 | 0 | 0.00 | 0 |
| George Uhle | 1919-1936 | .289 | 9 | 187 | 200 | 166 | 25 | 3.99 | 1135 |
| Maury Uhler | 1914-1914 | .214 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie Uhlir | 1934-1934 | .148 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Uhrig | 2030-2038 | .000 | 0 | 0 | 16 | 4 | 7 | 3.87 | 240 |
| Jerry Ujdur | 1980-1984 | .000 | 0 | 0 | 12 | 16 | 0 | 4.78 | 118 |
| Mike Ulisney | 1945-1945 | .389 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Ullger | 1983-1983 | .190 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ulloa | 2044-2046 | .267 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Sandy Ullrich | 1944-1945 | .280 | 0 | 0 | 3 | 3 | 1 | 5.04 | 28 |
| Sean Ulmer | 2035-2046 | .000 | 0 | 0 | 22 | 32 | 5 | 5.71 | 480 |
| Dutch Ulrich | 1925-1927 | .167 | 0 | 4 | 19 | 27 | 2 | 3.48 | 123 |
| George Ulrich | 1893-1896 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Arnold Umbach | 1964-1966 | .125 | 0 | 0 | 1 | 2 | 0 | 3.12 | 30 |
| Jim Umbarger | 1975-1978 | .000 | 0 | 0 | 25 | 33 | 3 | 4.14 | 244 |
| Jim Umbricht | 1959-1963 | .179 | 0 | 1 | 9 | 5 | 3 | 3.06 | 133 |
| Tom Umphlett | 1953-1955 | .246 | 6 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Underhill | 1927-1928 | .333 | 0 | 1 | 1 | 4 | 0 | 5.70 | 20 |
| Fred Underwood | 1894-1894 | .389 | 0 | 0 | 2 | 4 | 0 | 7.85 | 10 |
| Pat Underwood | 1979-1983 | .000 | 0 | 0 | 13 | 18 | 8 | 4.43 | 188 |
| Tom Underwood | 1974-1984 | .117 | 0 | 16 | 86 | 87 | 18 | 3.89 | 948 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Duane Underwood Jr. | 2018-2022 | .000 | 0 | 0 | 24 | 17 | 1 | 5.34 | 277 |
| Bob Unglaub | 1904-1910 | .258 | 5 | 216 | 0 | 0 | 0 | 0.00 | 0 |
| Riley Unroe | 2019-2022 | .216 | 2 | 42 | 0 | 0 | 0 | 16.88 | 1 |
| Tim Unroe | 1995-2000 | .221 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Al Unser | 1942-1945 | .251 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Del Unser | 1968-1982 | .258 | 87 | 481 | 0 | 0 | 0 | 0.00 | 0 |
| Woody Upchurch | 1935-1936 | .214 | 0 | 1 | 0 | 4 | 0 | 7.42 | 8 |
| Bill Upham | 1918-1918 | .222 | 0 | 0 | 1 | 1 | 0 | 5.23 | 8 |
| John Upham | 1967-1968 | .308 | 0 | 0 | 0 | 1 | 0 | 5.40 | 4 |
| Jerry Upp | 1909-1909 | .222 | 0 | 2 | 2 | 1 | 0 | 1.69 | 13 |
| Dixie Upright | 1953-1953 | .250 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Cecil Upshaw | 1966-1975 | .160 | 1 | 3 | 34 | 36 | 86 | 3.13 | 323 |
| Willie Upshaw | 1978-1988 | .262 | 123 | 528 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Upton | 1954-1954 | .000 | 0 | 0 | 0 | 0 | 1 | 1.80 | 2 |
| Justin Upton | 2007-2025 | .256 | 373 | 1158 | 0 | 0 | 0 | 0.00 | 1 |
| Tom Upton | 1950-1952 | .225 | 2 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Upton Jr. | 2004-2017 | .243 | 170 | 599 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Urban | 1957-1959 | .209 | 0 | 7 | 15 | 15 | 1 | 4.83 | 113 |
| Luke Urban | 1927-1928 | .273 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Urbanek | 2042-2042 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 4 |
| Tom Urbani | 1993-1996 | .246 | 1 | 4 | 10 | 17 | 0 | 4.98 | 149 |
| Billy Urbanski | 1931-1937 | .260 | 19 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Urbina | 2028-2033 | .258 | 25 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Urbina | 2043-2047 | .260 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Ugueth Urbina | 1995-2005 | .094 | 0 | 1 | 44 | 49 | 237 | 3.45 | 814 |
| Lino Urdaneta | 2004-2007 | .000 | 0 | 0 | 0 | 0 | 0 | 63.00 | 0 |
| Jhoan Urena | 2019-2023 | .206 | 5 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Urena | 2015-2019 | .133 | 0 | 0 | 10 | 20 | 3 | 4.81 | 214 |
| Richard Urena | 2018-2028 | .274 | 226 | 866 | 0 | 0 | 0 | 0.00 | 0 |
| Julio Urias | 2016-2032 | .136 | 0 | 2 | 223 | 125 | 1 | 3.32 | 2681 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Luis Urias | 2017-2032 | .288 | 116 | 988 | 0 | 0 | 0 | 0.00 | 1 |
| Jose Uribe | 1984-1993 | .241 | 19 | 219 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Uribe | 2001-2016 | .255 | 199 | 816 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Uribe | 2030-2045 | .000 | 0 | 0 | 173 | 109 | 18 | 3.40 | 2714 |
| R.J. Urick | 2030-2035 | .233 | 21 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| John Urrea | 1977-1981 | .162 | 0 | 4 | 17 | 18 | 9 | 3.74 | 202 |
| Henry Urrutia | 2013-2015 | .272 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Urrutia | 2030-2037 | .000 | 0 | 0 | 25 | 19 | 5 | 3.37 | 303 |
| Juan Urrutia | 2041-2042 | .248 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Giovanny Urshela | 2015-2020 | .248 | 17 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Lon Ury | 1903-1903 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Usher | 1946-1957 | .235 | 18 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Dutch Ussat | 1925-1927 | .176 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Mijalko Utjesenovic | 2022-2026 | .000 | 0 | 0 | 20 | 28 | 80 | 5.18 | 272 |
| Chase Utley | 2003-2017 | .277 | 250 | 982 | 0 | 0 | 0 | 0.00 | 0 |
| Omari Uzoma | 2039-2047 | .234 | 314 | 769 | 0 | 0 | 0 | 0.00 | 0 |
