The private pilot, with a passenger onboard, stated they were landing runway 11 and had completed a "3-point landing." On rollout, the airplane began to veer to the right. The pilot applied full left rudder and full left brake, but he was unable to stop the right turn. The airplane ground looped and came to rest in the grass on the right side of the runway. The airplane's left wing was substantially damaged when it struck the ground. The pilot indicated that there were no airplane mechanical malfunctions during the flight.