Behold, the rise of the tennis-coaching robots. First there was the PongBot, followed by the Tenniix and the Acemate. Now, there's the possibly even more capable ball-shooting, performance-assessing, ...

It was just this past week that we told you about the T-Apex, a mobile tennis-ball-serving robot that tracks and assesses players' returns. Well, the Acemate bot goes a step further, by actually ...

In the weeks leading up to the U.S. open, as preparations began in New York for America's marquee tennis event, correspondent Mo Rocca went to see the athletes at practice – running, rallying, rolling ...