The market for connected, stat-tracking tennis gadgets has blossomed seemingly overnight. Some companies offer motion-sensing, snap-on attachments; others sell fancy racquets with built-in sensors. The French company Babolat is taking the latter route with its pricey but capable Play Pure Drive racquet. I took advantage of Tennis Warehouses demo program to see if the $400 sensor-laden racquet could help me up my game.
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