Lonborg made his major league debut with the Red Sox in 1965. Over the next few years, he developed into a reliable starting pitcher. His breakout season came in 1967, a year that would forever be etched in the annals of Red Sox history. During this season, Lonborg won 22 games, leading the American League in victories. His performance was instrumental in propelling the Red Sox to the World Series, earning him the prestigious Cy Young Award, which is given annually to the best pitchers in Major League Baseball.
The 1967 World Series saw Lonborg deliver some of his most memorable performances. He pitched a one-hitter in Game 2 against the St. Louis Cardinals and followed it up with a three-hit shutout in Game 5. Although the Red Sox ultimately lost the series in seven games, Lonborg's efforts were widely praised.
Unfortunately, Lonborg's career faced a setback following a skiing accident in the offseason after the 1967 campaign. The injury affected his pitching arm, and he struggled to regain his previous form. Despite this, he continued to pitch for the Red Sox until 1971, when he was traded to the Milwaukee Brewers.
Lonborg spent just one season with the Brewers before being traded to the Philadelphia Phillies in 1972. With the Phillies, he found a measure of stability and enjoyed several productive seasons. He became a veteran presence on the pitching staff, contributing to the team's efforts to build a competitive squad.
Throughout his career, Lonborg was known for his strong work ethic and ability to adapt to changing circumstances. He retired from professional baseball in 1979, leaving behind a legacy of perseverance and achievement. After his baseball career, Lonborg pursued a career in dentistry, demonstrating his commitment to personal growth and community service.
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