A tennis ball having a felt covering which has superior abrasion resistance, felt appearance and resistance to fuzzing which may occur during the use of ball, the felt covering being made of a polyethylene terephthalate fiber including a polyethylene terephthalate (PET) polymer containing at least 90 mole % of recurring ethylene terephthalate units which satisfies the following parameters:(a) a value of hot air shrinkability/intrinsic viscosity of polymer falling within the range of 5.0 to 7.5%,(b) birefringence of 170.times.10.sup.-3 to 185.times.10.sup.-3,(c) Orientation factor for crystallites fc=0.935 to 0.950, and(d) amorphous molecular orientation parameter of 0.75 to 0.90.