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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jimmy Uchrinscko | 1926-1926 | .000 | 0 | 0 | 0 | 0 | 0 | 10.12 | 0 |
| Ryohei Uda | 2048-2051 | .000 | 0 | 0 | 26 | 31 | 15 | 4.66 | 479 |
| Bob Uecker | 1962-1967 | .200 | 14 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Koji Uehara | 2009-2019 | .000 | 0 | 0 | 47 | 28 | 103 | 3.12 | 763 |
| 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 |
| Josh Uhen | 2023-2024 | .000 | 0 | 0 | 2 | 6 | 6 | 7.86 | 68 |
| 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 |
| Jerry Ujdur | 1980-1984 | .000 | 0 | 0 | 12 | 16 | 0 | 4.78 | 118 |
| Antonio Ulibarri | 2031-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 3.24 | 3 |
| 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 |
| Sandy Ullrich | 1944-1945 | .280 | 0 | 0 | 3 | 3 | 1 | 5.04 | 28 |
| 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 |
| Narciso Umbelino | 2050-2051 | .000 | 0 | 0 | 8 | 8 | 0 | 4.06 | 117 |
| 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 |
| Jake Underhill | 2049-2050 | .000 | 0 | 0 | 4 | 14 | 0 | 6.66 | 189 |
| Willie Underhill | 1927-1928 | .333 | 0 | 1 | 1 | 4 | 0 | 5.70 | 20 |
| Duane Underwood | 2018-2028 | .111 | 0 | 0 | 23 | 39 | 5 | 5.46 | 448 |
| 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 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tom Underwood | 1974-1984 | .117 | 0 | 16 | 86 | 87 | 18 | 3.89 | 948 |
| Bob Unglaub | 1904-1910 | .258 | 5 | 216 | 0 | 0 | 0 | 0.00 | 0 |
| Riley Unroe | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Dylan Unsworth | 2017-2032 | .107 | 1 | 5 | 78 | 124 | 1 | 4.38 | 1213 |
| Ashton Upchurch | 2033-2040 | .188 | 5 | 11 | 22 | 35 | 5 | 5.87 | 405 |
| 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 |
| Bobby Upton | 2042-2043 | .286 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Upton | 2007-2024 | .261 | 343 | 1053 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Upton | 1950-1952 | .225 | 2 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Upton Jr. | 2004-2018 | .247 | 174 | 620 | 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 |
| 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 |
| 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 | 2019-2019 | .336 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Urena | 2015-2018 | .111 | 0 | 2 | 7 | 21 | 2 | 5.40 | 162 |
| Rafioby Urena | 2023-2035 | .258 | 183 | 608 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Urena | 2018-2028 | .281 | 332 | 1069 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Julio Urias | 2016-2021 | .188 | 2 | 19 | 31 | 30 | 1 | 4.26 | 562 |
| Alfonso Uribe | 2024-2025 | .233 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Javy Uribe | 2047-2049 | .000 | 0 | 0 | 14 | 15 | 27 | 4.08 | 222 |
| Jose Uribe | 1984-1993 | .241 | 19 | 219 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Uribe | 2001-2016 | .257 | 212 | 863 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Urps | 2012-2014 | .000 | 0 | 0 | 9 | 14 | 0 | 4.66 | 133 |
| John Urrea | 1977-1981 | .162 | 0 | 4 | 17 | 18 | 9 | 3.74 | 202 |
| Jeff Urry | 2039-2050 | .000 | 0 | 0 | 31 | 33 | 44 | 4.36 | 652 |
| Giovanny Urshela | 2015-2017 | .222 | 6 | 21 | 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 |
| Chase Utley | 2003-2017 | .280 | 237 | 931 | 0 | 0 | 0 | 0.00 | 0 |
| Devon Utley | 2050-2051 | .260 | 17 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Utz | 2035-2042 | .244 | 65 | 207 | 0 | 0 | 0 | 36.00 | 2 |
