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NEWS

2011 Tennis Ball Specifications

The following specifications are adopted by the USTA for tennis ball testing in accordance with (ITF) Rules of Tennis.

Table 1: Standard Tennis Ball Specifications

 
 TYPE 1
(FAST)
 TYPE 2 (MEDIUM)1  TYPE 3 (SLOW)2  HIGH ALTITUDE3
 WEIGHT
(MASS)
 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
(56.0-59.4 grams)
 SIZE
 2.57-2.700 inches
(6.54-6.86 cm)
 2.57-2.700 inches
(6.54-6.86 cm)
 2.76-2.87 inches
(7.00-7.30 cm)
 
 2.57-2.700 inches
(6.54-6.86 cm)
 REBOUND
 53-58 inches
(135-147 cm)
53-58 inches
(135-147 cm)
 53-58 inches
(135-147 cm)
 48-53 inches
(122-135 cm)
 FORWARD DEFORMATION4
 0.197-0.236 inches
(0.5-0.60 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
(0.559-0.74 cm)
 RETURN
DEFORMATION4
 0.264-0.358 inches
(0.670-0.91 cm)
 0.315-0.425 inches
(0.800-1.080 cm)
 0.315-0.425 inches
(0.800-1.080 cm)
 0.315-0.425 inches
(0.800-1.080 cm)
 
Notes:
1 This ball may be pressurized or pressureless. The Pressure less ball shall have an internal pressure that is no greater than 1 psi (7 kPa) and may be used for high altitude play above 4,000 feet (1,219m) above sea level and shall have been acclimatised for 60 days or more at the altitude of the specific tournament.
 
2This ball is also recommended for high altitude play on any court surface type above 4,000 feet (1,219 m) above sea level.
 
3This ball is pressurised and is an additional ball specified for high altitude play above 4,000 feet (1,219 m) 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 .031 inches (.08 cm).
 

TABLE 2: TENNIS BALL DURABLILITY SPECIFICATIONS

  WEIGHT (MASS) REBOUND
FORWARD
DEFORMATION
RETURN
DEFORMATION
MAXIMUM
CHANGE
0.014 ounces
(0.4 grams)
1.6 inches
(4.0 cm)
0.031 inches
(0.08 cm)
0.039 inches
(0.10 cm)
 

Specifications for Stage 3 (Red), Stage 2 (Orange), Stage 1 (Green) Introductory Tennis Balls

 
Stage 3 
(Red- foam)
Stage 3 
(Red- standard)
Stage 2
(Orange) 
Stage 1
(Green) 
 WEIGHT
(MASS)
0.882-1.517 ounces
(25.0-43.0 grams) 
1.270-1.728 ounces
(36.0-49.0 grams) 
1.270-1.654 ounces
(36.0-46.9 grams) 
1.658-1.817 ounces
(47.0-51.5 grams) 
SIZE 
3.15-3.54 inches
(8.00-9.00 cm) 
 2.76-3.15 inches
(7.00-8.00 cm)
 2.36-2.70 inches
(6.00-6.86 cm)
 2.48-2.70 inches
(6.30-6.86 cm)
REBOUND
HEIGHT
 33-41 inches
(85-105 cm)
 35-41 inches
(90-105 cm)
41-47 iinches
(105-120 cm) 
 47-53 inches
(120-135 cm)
 
 FORWARD
DEFORMATION
 
-- 
 
-- 
 0.551-0.650 inches
(1.40-1.65 cm)
 0.315-0.413 inches
(0.800-1.050 cm)
 
Notes:
There is currently no specification for return deformation.
There is currently no limit on the difference between individual forward deformation readings.
These specifications are subject to review and may be changed at any time.

 
 
 

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