He changes his racquet every 7 games, so if he goes 5 sets and each set is 7-6, that's about 9 frames worth. Half a set of Wilson Gut is $18 and half a set of Lux is about $7. That's $25 just for string, not including the labor. Top class stringer is $15 so each frame is $40 X 9. Do all you wannabee's have this kind of scratch ? Seems completely ludicrous when Rod Laver strung his racquets using an awl, won 10 Grand Slams and couldn't play in the Pros for 10 years. Progress is an illusion.