The author of How to Succeed at various things Without Really Trying tells us Everything We Always Wanted to Know About Tennis. Or, at least, what he thinks we want to know. Like, is tennis snobbery good? (Generally, no.) How to increase concentration: watch the ball, bend your knees, stay on your toes. One supposes that this is supposed to be funny and informative. Or at least cute and informative, or maybe just informative. It isn't.