Prepare grill to medium-high heat.
Rub steak evenly with salt, pepper, and garlic. Place steak on grill rack coated with cooking spray; cover and grill 6 minutes. Turn steak over; cover and grill 4 minutes or until desired degree of doneness. Remove steak from grill; cover and let stand 5 minutes. Cut steak diagonally across the grain into thin slices.