b. September 21, 1849 · Left fielder for the Brooklyn Atlantics, 1872 to 1872.

b. September 21, 1860 · Scored 177 runs and stole 106 bases in 1891, and was born in Liverpool.

b. September 21, 1883 · Center fielder who batted .256 across three clubs, 1905 to 1913.

b. September 21, 1886 · Left fielder for the St. Louis Browns, 1904 to 1904.

b. September 21, 1895 · Pitcher for the New York Giants, 1917 to 1917.

b. September 21, 1899 · Pitcher across two clubs, 1924 to 1927.

b. September 21, 1904 · Baseball figure for the Brooklyn Eagles, 1935 to 1935.

b. September 21, 1909 · Pitcher across two clubs, 1935 to 1936.

b. September 21, 1930 · Pitcher across three clubs, 1957 to 1962.

b. September 21, 1942 · Led the American League in strikeouts five times and was finished at thirty-two.

b. September 21, 1942 · Pitcher for the Philadelphia Phillies, 1969 to 1973.

b. September 21, 1948 · Pitcher across four clubs, 1974 to 1987.

b. September 21, 1952 · Right fielder across two clubs, 1975 to 1978.

b. September 21, 1959 · Pitcher across four clubs, 1983 to 1995.

b. September 21, 1963 · First baseman with 319 home runs across five clubs, 1985 to 1998.

b. September 21, 1969 · Left fielder for the Pittsburgh Pirates, 1993 to 1993.

b. September 21, 1977 · Pitcher across three clubs, 2002 to 2011.

b. September 21, 1981 · Pitcher across two clubs, 2006 to 2009.

b. September 21, 1984 · Pitcher across two clubs, 2008 to 2010.

b. September 21, 1985 · Pitcher across three clubs, 2009 to 2017.

b. September 21, 1988 · Right fielder for the Boston Red Sox, 2012 to 2012.

b. September 21, 1991 · Pitcher for the St. Louis Cardinals, 2013 to 2021.

b. September 21, 1993 · Pitcher across two clubs, 2017 to 2025.

b. September 21, 1994 · Reliever whose changeup, nicknamed the Airbender, made him National League Rookie of the Year and Reliever of the Year in 2020.

d. September 21, 1883 · Pitcher across two clubs, 1874 to 1876.

d. September 21, 1898 · First baseman across two clubs, 1882 to 1884.

d. September 21, 1907 · Second baseman for the St. Louis Browns, 1903 to 1903.

d. September 21, 1916 · Catcher for the Philadelphia Quakers, 1884 to 1884.

d. September 21, 1925 · Third baseman who batted .268 across three clubs, 1893 to 1902.

d. September 21, 1926 · Caught and played first base across ten recognized major-league seasons, with his best year in 1889.

d. September 21, 1935 · Catcher for the Pittsburg Alleghenys, 1888 to 1888.

d. September 21, 1935 · Left fielder who batted .266 across five clubs, 1896 to 1903.

d. September 21, 1940 · Shortstop for the Brooklyn Grays, 1887 to 1887.

d. September 21, 1945 · Pitcher across three clubs, 1910 to 1915.

d. September 21, 1949 · Shortstop for the Philadelphia Athletics, 1915 to 1915.

d. September 21, 1950 · Second baseman who batted .304 across three clubs, 1912 to 1917.

d. September 21, 1954 · Left fielder who batted .242 across six clubs, 1908 to 1915.

d. September 21, 1965 · Returned after nine seasons outside the majors and worked 251 innings for Boston in 1930.

d. September 21, 1970 · Pitcher for the Chicago White Sox, 1930 to 1931.

d. September 21, 1977 · Baseball figure for the New York Giants, 1926 to 1926.

d. September 21, 1985 · Pitcher for the Cleveland Buckeyes, 1944 to 1948.

d. September 21, 1987 · Pitcher across two clubs, 1939 to 1940.

d. September 21, 1989 · Won 20 games for a last-place Pittsburgh club and led the league in losses the next three years.

d. September 21, 1993 · Pitcher for the Chicago White Sox, 1928 to 1928.

d. September 21, 1995 · Lost the 1945 batting race by less than a point at thirty-seven and was released that winter.

d. September 21, 2009 · Right fielder for the Detroit Tigers, 1962 to 1963.

d. September 21, 2018 · Pitcher across four clubs, 1961 to 1970.

d. September 21, 2025 · Catcher across three clubs, 1953 to 1963.