Christenson made his MLB debut on April 13, 1973, at the age of 19, showcasing his potential as a young pitcher. Over the next decade, he became a mainstay in the Phillies' pitching rotation. Known for his tall frame and strong arm, Christenson was a reliable starter for the team. His career was marked by both impressive performances and unfortunate injuries, which at times hindered his ability to consistently contribute to the team.
One of the highlights of Christenson's career came in 1977 when he posted a 19-6 record with a 4.06 ERA. This season was instrumental in helping the Phillies secure the National League East title. Christenson's ability to deliver solid outings was a valuable asset to the Phillies during this period of success for the franchise.
Injuries, however, were a recurring challenge for Christenson. He underwent multiple surgeries throughout his career, including procedures on his elbow and collarbone. These setbacks limited his playing time and affected his performance on the mound. Despite these challenges, Christenson continued to persevere and contribute to the Phillies whenever he was able to take the field.
Christenson was part of the Phillies team that won the World Series in 1980, although he did not pitch in the postseason due to injury. Nonetheless, his efforts during the regular season helped the team reach the playoffs, and he shared in the triumph of the franchise's first World Series championship.
Throughout his career, Christenson compiled a record of 83 wins and 71 losses, with an ERA of 3.79 and 781 strikeouts. His career was characterized by moments of brilliance tempered by the physical challenges he faced.
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