Montgomery Biscuits
On December 7, 2005, Carvajal was traded to the Seattle Mariners for catcher Yorvit Torrealba. On April 6, , he was sent to the Tampa Bay Devil Rays in exchange for a minor leaguer. He would then spend the whole 2006 season with the Double-A Montgomery Biscuits, posting a 3.86 ERA in 72.1 innings.