In It's Not My Fault, author Joshua Shifrin helps tennis players make sense of their most monumental losses on the court. The next time a player goes down in defeat, he or she can always explain the woeful loss with "My opponent was a pusher . . . I can't play against pushers." Or after a bad shot, tennis gurus might try to get out of dodge by uttering, "There was a leaf on the court and I couldn't concentrate."