Samuel Jethroe, nicknamed "the Jet", was an American center fielder in Negro league and Major League Baseball. With the Cincinnati & Cleveland Buckeyes he won a pair of batting titles, hit .340 over seven seasons from 1942 to 1948, and helped the team to two pennants and the 1945 Negro World Series title. He was named the National League's Rookie of the Year in 1950 with the Boston Braves, and led the NL in stolen bases in his first two seasons.

In Major League Baseball, the Rookie of the Year Award is given annually to two outstanding rookie players, one each for the American League (AL) and National League (NL), as voted on by the Baseball Writers' Association of America (BBWAA). The award was established in 1940 by the Chicago chapter of the BBWAA, which selected an annual winner from 1940 through 1946. The award became national in 1947; Jackie Robinson, the Brooklyn Dodgers' second baseman, won the inaugural award. One award was presented for all of MLB in 1947 and 1948; since 1949, the honor has been given to one player each in the NL and AL. Originally, the award was known as the J. Louis Comiskey Memorial Award, named after the Chicago White Sox owner of the 1930s. The award was renamed the Jackie Robinson Award in July 1987, 40 years after Robinson broke the baseball color line.