The Rise of Tennis' Bad Boys and Girls

Has tennis changed from a genteel sport to one where the display of aggression has become more acceptable? We look at the on-court behaviour of players like Rod Laver, McEnroe, Agassi, Federer, Nadal, Kyrgios, Tsitsipas, and Serena Williams. What if we say that some conflict and emotional outbursts can help create excitement for the game?