Meanwhile, make sauce by heating oil in 2-quart saucepan over medium heat. Add crushed garlic and 1/4 teaspoon pepper flakes; cook 2 to 3 minutes or until garlic is fragrant. Add tomatoes, 1/2 teaspoon salt and the basil leaves; heat to simmering. Stir; cook 4 to 5 minutes or until slightly thickened. Remove from heat; cool 5 minutes. Carefully transfer to blender. Vent blender top, and cover with kitchen towel. Blend sauce 40 to 45 seconds or until garlic and basil are blended with tomatoes. Serve sauce warm with meatballs.