American professional baseball player, one of the greatest left-handed pitchers in history.

Grove began his professional career in 1920, winning 108 games for the minor league Baltimore Orioles of the International League before he was bought by Connie Mack (Mack, Connie) of the American League Philadelphia Athletics (A's) for $100,000, a record sum at the time. Grove debuted for the A's at age 25 and led the league in strikeouts.

Not until he mastered control of his pitches, however, did he become a star pitcher of his time. From 1927 through 1933 Grove won at least 20 games each season. In 1931 he was 31–4 with Philadelphia and won the Most Valuable Player award. Mack was forced to sell Grove to the Boston Red Sox in 1934. Grove completed his career there in 1941 with 300 wins, 141 losses, and a career earned run average of 3.06, one of the best in history. He led the league in strikeouts seven times and earned run average nine times. In 1947 Grove was elected to the Baseball Hall of Fame in Cooperstown, New York.