Combine soy sauce, oil, Worcestershire sauce, lemon juice, brown sugar and ketchup in a small bowl. Place pork chops in a medium size baking dish and brush half of the mixture.
Bake in preheated oven to 350ºF (180º) for 30 minutes. Turn pork chops and brush them with remaining sauce. Continue baking for 30 minutes more or until pork chops are done.