It's a loss in point, sure. But once it gets to the points someone is send to the hospital (which hasn't occur in real life I presume) I think it's fair that it might result in disqualification.
In
http://www.nelsontennisclub.com/tennis_code_of_conduct.html, it say
37. Injury caused by a player. When a player accidentally injures an opponent, the opponent suffers the consequences. Consider the situation where the Server’s racket accidentally strikes the Receiver and incapacitates the Receiver. The Receiver is unable to resume play within the time limit. Even though the Server caused the injury, the Server wins the match by retirement. On the other hand, when a player deliberately injures an opponent and affects the opponent’s ability to play, then the opponent wins the match by default.
Hitting a ball or throwing a racket in anger is considered a deliberate act.
In mhsa.org, it also state
Hitting ball or throwing racquet at/near person. 4 points. Disqualification/Ejection.
as well. Even in wikipedia it say
Disqualifications in tennis can occur for unsporting conduct.
ATP rules state that:
Players shall not at any time physically abuse any official, opponent, spectator or other person within the precincts of the tournament site. For purposes of this rule, physical abuse is the unauthorized touching of an official, opponent, and spectator or other person.
If you google the above line, you'll see it's repeat in many other website.
