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 except for the Stage 3 (Red) foam ball. If there are any seams they shall be stitchless.

b. The ball shall conform to one of types specified in the table immediately below or in the table under paragraph (d).

- Type 1
(Fast)
Type 2
(Medium)1
Type 3
(Slow)2
High Altitude3
Mass (Weight) 56.0-59.4 grams
(1.975-2.095 ounces)
56.0-59.4 grams
(1.975-2.095 ounces)
56.0-59.4 grams
(1.975-2.095 ounces)
56.0-59.4 grams
(1.975-2.095 ounces)
Size 6.54-6.86 cm
(2.57-2.70 inches)
6.54-6.86 cm
(2.57-2.70 inches)
7.00-7.30 cm
(2.76-2.87 inches)
6.54-6.86 cm
(2.57-2.70 inches)
Rebound 135-147 cm
(53-58 inches)
135-147 cm
(53-58 inches)
135-147 cm
(53-58 inches)
122-135 cm
(48-53 inches)
Forward Deformation4 0.50-0.60 cm
(0.197-0.236 inches)
0.56-0.74 cm
(0.220-0.291 inches)
0.56-0.74 cm
(0.220-0.291 inches)
0.56-0.74 cm
(0.220-0.291 inches)
Return Deformation4 0.67-0.91 cm
(0.264-0.358 inches)
0.80-1.08 cm
(0.315-0.425 inches)
0.80-1.08 cm
(0.315-0.425 inches)
0.80-1.08 cm
(0.315-0.425 inches)
Colour White or Yellow White or Yellow White or Yellow White or Yellow

 

Notes:
1   This ball type 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 type 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 type 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, all ball types specified under paragraph (b) shall conform to the requirements for durability as shown in the following table:

- Mass (Weight) Rebound Forward Deformation Return Deformation
Maximum Change1 0.4 grams
(0.014 ounces)
4.0 cm
(1.6 inches)
0.08 cm
(0.031 inches)
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.


d. Only the ball types specified in the table below can be used in 10 and under tennis competition:

- Stage 3
(Red)
Foam
Stage 3
(Red)
Standard
Stage 2
(Orange)
Standard
Stage 1
(Green)
Standard
Mass (Weight) 25.0-43.0 grams
(0.882-1.517 ounces)
36.0-49.0 grams
(1.270-1.728 ounces)
36.0-46.9 grams
(1.270-1.654 ounces)
47.0-51.5 grams
(1.658-1.817 ounces)
Size 8.00-9.00 cm
(3.15-3.54 inches)
7.00-8.00 cm
(2.76-3.15 inches)
6.00-6.86 cm
(2.36-2.70 inches)
6.30-6.86 cm
(2.48-2.70 inches)
Rebound 85-105 cm
(33-41 inches)
90-105 cm
(35-41 inches)
105-120 cm
(41-47 inches)
120-135 cm
(47-53 inches)
Forward Deformation1 ----- ----- 1.40-1.65 cm
(0.551-0.650 inches)
0.80-1.05 cm
(0.315-0.413 inches)
Colour2 Any Red and Yellow,
or Yellow with a
Red dot
Orange and Yellow,
or Yellow with an
Orange dot
Yellow with a
Green dot

 

Notes:
1 The deformation shall be the average of a single reading along each of three perpendicular axes. There is no limit on the difference between individual forward deformation readings. There is no specification for return deformation.
2 All coloured dots shall be reasonable in size and placement.


e. All tests for rebound, mass, size, deformation and durability shall be made in accordance with the Regulations described in the current edition of ITF Approved Tennis Balls, Classified Surfaces & Recognised Courts.

CLASSIFICATION OF COURT PACE

The ITF test method used for determining the pace of a court surface is ITF CS 01/02 (ITF Court Pace Rating) as described in the ITF publication entitled “ITF guide to test methods for tennis court surfaces”.

Court surfaces which have an ITF Court Pace Rating of 0 to 29 shall be classified as being Category 1 (slow pace). Examples of court surface types which conform to this classification will include most clay courts and other types of unbound mineral surface.

Court surfaces which have an ITF Court Pace Rating of 30 to 34 shall be classified as being Category 2 (medium-slow pace), while court surfaces with an ITF Court Pace Rating of 35 to 39 shall be classified as being Category 3 (medium pace). Examples of court surface types which conform to this classification will include most acrylic coated surfaces plus some carpet surfaces.

Court surfaces with an ITF Court Pace Rating of 40 to 44 shall be classified as being Category 4 (medium-fast pace), while court surfaces which have an ITF Court Pace Rating of 45 or more shall be classified as being Category 5 (fast pace). Examples of court surface types which conform to this classification will include most natural grass, artificial grass and some carpet surfaces.

Case 1: Which ball type should be used on which court surface?

Decision: 3 different types of balls are approved for play under the Rules of Tennis, however:
a. Ball Type 1 (fast speed) is intended for play on slow pace court surfaces
b. Ball Type 2 (medium speed) is intended for play on medium-slow, medium and medium-fast pace court surfaces
c. Ball Type 3 (slow speed) is intended for play on fast pace court surfaces


Note:
For a two-year trial (2014- 2015), in addition to the ball types specified under paragraph (b) above, the Stage 1 (Green) ball may be used for all levels of competitive play except for world ranking professional tennis events, Davis Cup and Fed Cup, Junior Tournaments and Team events sanctioned by the ITF and affiliated regional associations, ITF Senior circuit and team events and ITF Wheelchair Circuit and Team events.
During this trial period each National Association shall have the right to decide which national competitive events should use the Stage 1 (Green) ball.



SPECIFIC EQUIPMENT RULES

Follow the links below to find the latest rules and specifications for tennis balls, rackets, courts and player analysis technology:

Balls

Rackets

Courts

Player Analysis Technology

MORE RULES ABOUT BALLS

Follow the links below to find out more about the rules regarding balls including developments to rules over time, Appendix I, and Appendix VI:

Overview

History

Appendix I: The Ball

Appendix VII: 10 and under Tennis Competition