In Greco-Roman and freestyle, the format is now two three-minute periods. Before each match, each wrestler's name is called, and the wrestler takes his place at the corner of the mat assigned to his color. The referee then calls them to his side at the center of the mat, shakes hands with them, inspects their apparel, and checks for any perspiration, oily or greasy substances, and any other infractions. The two wrestlers then greet each other, shake hands, and the referee blows his whistle to start the period.