Charlton Atlee Hammaker (born January 24, 1958) is a former Major League Baseball left-handed pitcher who played the majority of his career for the San Francisco Giants, from 1982 to 1990. He also played for the Kansas City Royals, San Diego Padres, and Chicago White Sox. During his twelve-year career, he won 59 games, lost 67 games and netted five saves.
Hammaker was born in Carmel, California, on January 24, 1958, the son of Miyake and Charles Hammaker. A middle child; he has one older brother, Aldine and one younger sister, Charlene. He is half German and half Japanese.
In 1983, Hammaker's best season, he led the National League with an ERA of 2.25, a WHIP of 1.039, BB/9IP of 1.67, and strikeout to walk ratio of 3.97. That year Hammaker won 10, lost 9, and made the National League All-Star team. (Through June, his record was 9–3 with an ERA of 1.52.)
Hammaker made the National League All-Star team in 1983, but did not fare well, surrendering seven earned runs in 0.2 inning pitched; and he gave up the only grand slam in All-Star Game history, to Fred Lynn. The American League prevailed 13–3 for their first win in twelve years.