Hassler played for the Angels for four seasons before being traded to the Kansas City Royals in 1975. He spent two seasons with the Royals before being traded to the Boston Red Sox in 1977. Hassler played for the Red Sox for two seasons before being traded to the New York Mets in 1979.
Hassler played for the Mets for one season before being traded to the Los Angeles Dodgers in 1980. He spent two seasons with the Dodgers before being traded to the California Angels in 1982. Hassler played for the Angels for two seasons before being traded to the Kansas City Royals in 1984. He finished his career with the Boston Red Sox in 1985.
Throughout his career, Hassler was primarily used as a relief pitcher. He had a career record of 44 wins and 71 losses, with an ERA of 3.84. Hassler was known for his ability to pitch effectively against left-handed batters, and he often came into games specifically to face them.
Hassler's best season came in 1977 when he played for the Boston Red Sox. He had a record of 9 wins and 6 losses, with an ERA of 2.65. He also had 7 saves and pitched in 57 games that season.
After retiring from baseball, Hassler worked as a pitching coach for several minor league teams. He also worked as a scout for the Kansas City Royals and the San Francisco Giants.
Hassler passed away on June 12, 2019, at the age of 67. He is remembered as a reliable left-handed pitcher who was a valuable asset to the teams he played for.
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