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The Singles Game3. The Ball The ball shall conform to the requirements specified in Appendix I (Regulations for making tests specified in Rule 3.) Section iv for size and be more than two ounces (56.7 grams) and less than two and one-sixteenth ounces (58.5 grams) in weight. The ball shall have a bound of more than 53 inches (134.62cm.) and less than 58 inches (147.32cm.) when dropped 100 inches (254.00cm.) upon a concrete base. The ball shall have a forward deformation of more than .220 of an inch (.559cm.) and less than .290 of an inch (.737cm.) and a return deformation of more than .315 of an inch (.800cm.) and less than .425 of an inch (1.080cm.) at 18 lb. (8.165kg.) load. The two deformation figures shall be the averages of three individual readings along three axes of the ball and no two individual readings shall differ by more than .030 of an inch (.076cm.) in each case. For play above 4,000 feet (1219m.) in altitude above sea level, two additional types of ball may be used. The first type is identical to those described above except that the bound shall be more than 48 inches (121.92cm.) and less than 53 inches (134.62cm.) and the ball shall have an internal pressure that is greater than the external pressure. This type of tennis ball is commonly known as a pressurized ball. The second type is identical to those described above except that they shall have a bound of more than 53 inches (134.62cm.) and less than 58 inches (147.32cm.) and shall have an internal pressure that is approximately equal to the external pressure and have been acclimatized for 60 days or more at the altitude of the specific tournament. This type of tennis ball is commonly known as a zero-pressure or non-pressurized ball. All tests for bound, size and deformation shall be made in accordance
with the regulations in Appendix I. ITF Note: Any ball to be used in a tournament which is played under the Rules of Tennis must be named on the official ITF list of approved balls issued by the International Tennis Federation. |
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