In 2006, Igawa announced his intention to play in North America. On November 16, 2006, Igawa was posted by the Hanshin Tigers. On November 29, 2006, it was announced that the New York Yankees were the highest bidders at $26,000,194, with the last three digits representing his strikeout total for the 2006 season. He signed a five-year, $20 million contract on December 27, 2006. On January 8, , Igawa was officially announced at a Yankee Stadium press conference. On April 7, 2007, he made his major league debut, allowing 7 earned runs in five innings, but received a "no decision" because of Alex Rodriguez's walk-off grand slam. Igawa later earned wins in relief appearances against the Cleveland Indians and Boston Red Sox.