In A Resealable Plastic Bag, Combine The Ketchup, Vinegar, Oil, Soy Sauce, Worcestershire Sauce, Mustard, Garlic Powder, Salt And Pepper; Add Meat. Seal Bag And Turn To Coat; Refrigerate 8 Hours Or Overnight. Drain And Discard Marinade. Grill, Covered, Over Medium Heat Or Broil 4 In. From Heat For 6-8 Minutes On Each Side Or Until Meat Reaches Desired Doneness (For Medium-Rare, A Meat Thermometer Should Read 145 Degrees F; Medium, 160 Degrees F; Well-Done, 170 Degrees F).