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APPENDIX I THE BALL


For all measurements in Appendix I, SI units shall take precedence.


a. The ball shall have a uniform outer surface consisting of a fabric cover and shall be white or yellow in colour. If there are any seams they shall be stitchless.


b. More than one type of ball is specified. The ball shall conform to the requirements shown in the table below.


TYPE 1 (FAST)


MASS (WEIGHT) SIZE REBOUND FORWARD RETURN DEFORMATION4 DEFORMATION4


56.0-59.4 grams (1.975-2.095 ounces)


6.54-6.86 cm (2.57-2.70 inches)


135-147 cm (53-58 inches) 0.50-0.60 cm


(0.197-0.236 inches) 0.67-0.91 cm


(0.264-0.358 inches) (MEDIUM)1 TYPE 2


56.0-59.4 grams (1.975-2.095 ounces)


6.54-6.86 cm (2.57-2.70 inches)


135-147 cm (53-58 inches) 0.56-0.74 cm


(0.220-0.291 inches) 0.80-1.08 cm


(0.315-0.425 inches)


TYPE 3 (SLOW)2


56.0-59.4 grams (1.975-2.095 ounces)


7.00-7.30 cm (2.76-2.87 inches)


135-147 cm (53-58 inches) 0.56-0.74 cm


(0.220-0.291 inches) 0.80-1.08 cm


(0.315-0.425 inches) HIGH ALTITUDE3


56.0-59.4 grams (1.975-2.095 ounces)


6.54-6.86 cm (2.57-2.70 inches)


122-135 cm (48-53 inches) 0.56-0.74 cm


(0.220-0.291 inches) 0.80-1.08 cm


(0.315-0.425 inches)


Notes: 1 This ball may be pressurised or pressureless. The pressureless ball shall have an internal pressure that is no greater than 7 kPa (1 psi) and may be used for high altitude play above 1,219 m (4,000 feet) above sea level and shall have been acclimatised for 60 days or more at the altitude of the specific tournament. 2 This ball is also recommended for high altitude play on any court surface type above 1,219 m (4,000 feet) above sea level. 3 This ball is pressurised and is an additional ball specified for high altitude play above 1,219 m (4,000 feet) above sea level only. 4 The deformation shall be the average of a single reading along each of three perpendicular axes. No two individual readings shall differ by more than 0.08 cm (0.031 inches).


c. In addition, the ball shall conform to the requirements for durability as shown in the following table:


MASS (WEIGHT)


MAXIMUM CHANGE1


0.4 grams (0.014 ounces) REBOUND 4.0 cm (1.6 inches) FORWARD


DEFORMATION 0.08 cm


(0.031 inches) RETURN


DEFORMATION 0.10 cm


(0.039 inches)


Notes: 1 The largest permissible change in the specified properties resulting from the durability test described in the current edition of ITF Approved Tennis Balls, Classified Surfaces & Recognised Courts. The durability test uses laboratory equipment to simulate the effects of nine games of play.


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