US Open - what shooting is this?

rleppane

New User
Hello
I watched some of the US Open 2011 matches. E.g. in this one:
http://www.youtube.com/watch?v=HX9eAgni8cE
there is a person sitting beside the court shooting the course of the ball with some kind of long black stick. I haven't seen this in other grand slams. For what purpose is that shooting? Is it a directional microphone used to enhance voices from the racket hitting the ball? If it's for that, it looks a bit low tech means for that.
Anyone able to advise me?
 
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