The troll is strong with this one.
Regarding Serena -- She admits that her build is too muscular for her liking, but somehow I feel like being #1 in the world is probably worth the minor complex. Also having played tennis for a long time I'll say it is quite easy to get very pissed at a bad call. She made the mistake of letting it out.
Regarding Claire -- There are ways around this problem. A simple change of "formation" is one. A brown paper bag is another.