Not only the racket and the string matter ! Balls have direct impact on the game.
A mini-tennis ball for learning which is 50% slower.
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One more round to go to #MainDraw @zanevskamaryna & @DKasatkina @usopen. Come on you girls ! #qualies #USOpen2015 http://t.co/XF2VP1P0sX
28 Aug. - 09h58