Standard Measurements used in Tennis
Size of court: 120 feet long by 60 feet wide, with rectangle marked off at 78 feet long by 27 feet wide (singles) and 78 feet long by 36 feet wide (doubles). Height of net: 3 feet in center, gradually rising to reach 3-foot 6-inch posts at a point 3 feet outside each side of court. Ball: Shall be more than 2 1/2 inches and less than 2 5/8 inches in diameter and weigh more than 2 ounces and less than 2 1/6 ounces. Service line: 21 feet from net.