Canadian Player hit's ball at Umpire's face to hand GB Davis Cup Win
This is not only unfortunate for the Umpire but for the Canadian team to lose simply because one player on the team loses control. It is justifiable to hand over a win to the other side. An umpire shouldn't have to worry about being attacked. An errant ball is one thing but this ball was hit when play was finished so whatever happens when you fire a ball off is your responsibility.
Eye Balled
Tennis player gets mad
Competitors can learn from this. Most of the time it goes beyond self control issues and it has to do with ego. Some players act out as if to say they are better than what just transpired in the point. As frustration builds some players resort to physical displays not much different than a tantrum. It rarely helps though at times if the umpire doesn't act these displays will interfere with the match and distract an opponent. In the 70's and 80's some of the players used antics as a form of gamesmanship to disrupt the match when they were losing. Rule changes have made this less of a problem but actions like this cannot be managed. The fine is justifiable as well. Hopefully this players will fully learn from it. It is apparent that he didn't purposely try to hit the umpire based on his reaction when he hit him but by then it was too late.
#1 rule. When you hit a ball and send it downrange and it is not during a point whatever happens is on you. During a point it can still be on you if you appear to purposely aim a ball at a linesman or referee and umpire while throwing away a point.