Originally Posted by Boricua
Look in youtube "Technifibre Human Machine". Chris from TW interviews a guy who hits balls all day in order to test and break strings. Its interesting.
Old, but still interesting. The video, I mean.
Nice job for Nadal at Babolat after he retires.
"I mean, sure, the APD is 'popular,' but has anybody ever used it to win anything major?" - Kalethan