 Slowey ascended rapidly through the Twins minor league system and after failing to make the team as a dark horse candidate out of spring training, he began the 2007 season with the Triple-A Rochester Red Wings.After a 6-2 start 1.54 ERA, 57 strikeouts, and 5 walks for the Red Wings, he was called up to the Twins and made his major league debut on June 1, 2007 as a replacement for struggling Ramón Ortiz in the starting rotation.In his first major league start against the Oakland Athletics, Slowey received a no decision in a Twins 3-2 win.