Ok so I don't watch much tennis or really any at all, but i'm trying to get into it as a I now have 5 year old step daughter who is becoming interested. anywho, I saw what happened to Novak Djokovic at the US open and I really need an explanation of this rule. From my perspective the official was not paying attention, which is probably a bad idea when on the playing surface with a professional athlete, and then gets hit. Then the athlete was disqualified from the tournament. What kind of ridiculousness is that. Is that the case in any other sports? Anyone paying attention to tennis?