The Arizona Diamondbacks are a professional baseball team based in Phoenix, Arizona. They play in the West Division of Major League Baseball 's National League. From 1998 to the present, they have played in Chase Field (formerly Bank One Ballpark). Also known as the D-backs and Snakes, Arizona has one World Series title, in 2001, becoming one of the fastest teams in the majors to win a championship, doing it in only 3 years since their expansion in 1998.wholesale Arizona Diamondbacks hats