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Hope you find it useful!
Bang Bang Tennis is now on the app store
iTunes Link: https://itunes.apple.com/us/app/bang-bang-tennis/id1191420402?ls=1&mt=8
Swing™ Has Arrived!
Free for iOS: https://appsto.re/us/fTF-6.i
2 years in development by computer scientists, statisticians, and tennis...