1Mix all ingredients except scallops; reserve 4 cups. Mix remaining melon relish and the scallops in glass or plastic bowl. Cover and refrigerate scallop mixture and 4 cups reserved relish separately at least 1 hour but no longer than 24 hours.
2Set oven control to broil. Spray broiler pan rack with cooking spray. Remove scallops from marinade; discard marinade. Thread scallops on twelve 11-inch skewers. Place on rack in broiler pan. Broil with tops about 4 inches from heat 3 minutes; turn. Broil about 3 minutes longer or until scallops are white.
3Serve reserved 4 cups relish over scallops.