Combine 1/2 cup ketchup, breadcrumbs, and the next 6 ingredients (breadcrumbs through beef) in a large bowl. Add tomatoes to meat mixture. Shape meat mixture into a 9 x 5-inch loaf on a broiler pan coated with cooking spray. Spread 1/3 cup ketchup over meat loaf. Bake at 350° for 1 hour or until a thermometer registers 160°. Let stand 10 minutes before slicing. Cut into 12 slices.