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.