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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After his win over #Melzer 6/4-6/1, @jimchardy will play today against world number 6 #Raonic ! #MiamiOpen Come on ! http://t.co/HCaSWfqOxz
30 Mar. - 07h56