people think that players use retail products for their entire developmental careers then as soon as they turn pro they get access to some magical black market DARPA reverse engineered alien tech tennis products. It's pretty much the same crap everyone has access to. Even prostock is way overrated. If you ever wonder why top players play better than you, it's practice and skill. That's it. There is not magical equipment that gets them there that anyone of us don't have access to.