How are “unclean hits” judged in tennis? I mean situations like a ball slipping on a racket, or unintentionally hitting the racket twice (e.g. when the player does not hold the racket firmly enough).
In the official rules, I have found rule 24 (f), stating the point is lost if “The player deliberately carries or catches the ball in play on the racket or deliberately touches it with the racket more than once” (emphasis mine). Does this mean unintentional double touches or prolonged contact are fine?
Also, my friends debated whether hits by the rim are allowed or not. As I have found no mention about that in the rules, I suppose hits by any part of the racket (not only the strings) are allowed. Is that correct?