In 1998, Pettyjohn was drafted by the Detroit Tigers in the 2nd round (73rd overall). He signed for a $392,500 bonus. Pettyjohn spent less than three years in the minor leagues before reaching the Major Leagues, posting an ERA as low as 1.97. On July 16, 2001, the 6\'3" 190 pound pitcher made his MLB debut at the age of 24, wearing jersey number 57. His first strikeout was Ken Griffey, Jr..\n', '

In 2002, Pettyjohn did not play professional baseball because he had to undergo a colectomy due to ulcerative colitis. In 2003, he played in the Detroit Tigers organization. He was released by the Tigers on March 28, 2004. He spent 2004 playing for the San Francisco Giants and Oakland Athletics organizations. He spent the 2005 season and the start of the 2006 season with the Long Beach Armada of the Golden Baseball League before spending time again with the Athletics as well as the Seattle Mariners organizations.\n', '

Pettyjohn signed a minor league contract with the Milwaukee Brewers on December 12, 2006. He started the 2007 season with the Huntsville Stars of the Southern League, Milwaukee\'s Double-A affiliate. As the opening day starter for the Stars on April 5, 2007 Pettyjohn gave up four hits, two earned runs, and a walk while striking out seven and getting a no-decision in the team\'s 4-3 victory over the Mississippi Braves. On June 1, he was promoted to the Triple-A Nashville Sounds. He led Triple A that season with 15 wins and was named the best left-handed pitcher in Triple A as well as being on the PCL All Star team.\n', '

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