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网球的球体由橡胶和若干种合成材料制成。用来使球面变得毛茸茸的是一种用羊毛和尼龙织成的绒毛布。在粘上绒毛布之前，球体的表面又硬又滑，球受击后，球速极快。给网球加上绒毛，则可以减慢球速。球面布满绒毛后，网球受到的风阻加大，不仅反弹力减弱，球速也会减慢。给网球加上绒毛，还可以增加球拍对球的控制力。球每次接触球拍，球拍上的网线会将球扣住片刻，同时球会压缩。如果球的表面硬而光滑，球通常会立即从球拍反弹，使选手较难发挥球技。
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