There are catch all rules for unsportsmanlike conduct. This is not unsportsmanlike conduct. Unless you are a Fed fanYou forgot to provide the specific ITF rule. But if you search I’m not sure you’ll find a specific rule prohibiting it but probably will find some general catch-all rule. The same one that would prohibit messing with the ball for the purpose of changing its performance, if that is what Milkman was doing. I didn’t see the match.