Zimmermann was born in Auburndale, Wisconsin, where he played all four years of high school on the varsity team at Auburndale High School. He began his career as a catcher, then moved to multiple positions due to his versatility. He was used as a starting pitcher as well as a closer in tight games. Zimmermann attended the University of Wisconsin-Stevens Point, and was drafted by the Washington Nationals in the second round of the 2007 Major League Baseball Draft.\n', '

In 2008, Zimmermann had a combined 10–3 record with a 2.89 earned run average (ERA) with the Potomac Nationals of the Class A-Advanced Carolina League and the Harrisburg Senators of the Class AA Eastern League, and in July was named to the Eastern League All-Star team. He finished the season leading the organization in wins, strikeouts, and earned run average, and was the MILB.com Nationals pitcher of the year.\n', '

Zimmermann was rated the Nationals\' best prospect going into the 2009 MLB season, according to Baseball America. In 2009, Zimmermann made the Nationals\' roster as the fifth starter; however, the Nationals did not need him in the rotation until mid-April, so Zimmermann opened the season with the Triple-A Syracuse Chiefs. Zimmermann\'s contract was purchased on April 20, 2009, and he made his major league debut that night, after a two-plus hour rain delay, against the Atlanta Braves. He pitched six innings, allowing two runs on six hits, with three strikeouts and a walk, earning the victory.\n', '

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