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Could be better or worse than the In/Out tennis device. 
www.baselinevision.com

Baseline Vision - Tennis. Re-invented
Take your tennis experience to the next level with instant statistics, gamified drills, 3D Challenges and on-court video replays. Track your performance with sessions history, dashboards and worldwide ranking. All that, using the Baseline Cam, a portable and easy-to-install single camera device.
