Wearables have come a long way since the Casio Databank watch debuted in the 1980s. These days, our wearables remind us to get moving, let us pay for purchases without a wallet, and help us stay in touch through emails, texts, and calls – is it any surprise that the tennis industry is also bursting with sensors, watches and other gadgets that allow us to gather, record and review copious amounts of information about our performance? From big names like Sony to young startups like Pulse Play, tennis players now have a wide variety of data tracking products to explore.