Pour remaining steak sauce mixture over steaks in shallow glass dish; turn to evenly coat both sides of steak with sauce. Refrigerate 30 min. to marinate.
Heat grill to medium-high heat.
Remove steaks from marinade; discard marinade.
Grill steaks 4 to 5 min. on each side or until medium doneness (160F).
Cut steaks in half; serve topped with reserved sauce.