In recent years there has been a proliferation of so-called smart rackets and other high-tech gadgets, including Sony’s Smart Tennis Sensor and Babolat’s Play racket, that compile data on strokes. This fall, Babolat will introduce POP, a wristband that will provide similar analysis when used with any racket.
Those advances in racket technology range in price from $90 to $250, but many cheaper accessories nibble at the edges, less likely to give a top pro an edge than to be bought by a club player looking for a slight boost or protection against injury.