[1] A new development with the Internet of Things is the launch of a new range of smart sensor racquets at the Australian Open.
[2] The new smart racquets features Sony’s proprietary Smart Tennis Sensor, that is wirelessly connect to smart devices using Bluetooth, and the data visualized through an Android or iOS app.
[3] In addition to the real-time visualizations of swings, the app can display shot metrics and record rallies, simultaneously.
[Source] http://www.businessspectator.com.au/news/2015/1/21/technology/smart-racquets-hit-australian-open