The balls used in men's and women's tennis are different. (They are the same size, weight and pressure: between 2½ and 2 5/8 inches (6.35 and 6.67 cm) in diameter and weighing between 2 and 2 1/16 ounces (57.7 and 58.5 grams) but balls used by men have an extra-duty felt covering, which increases air […]