Fourth in a series that will take you to area tennis courts and hopefully get you active. The trick is to avoid getting caught by the tennis players while grabbing the cache. You can do this by going for the grab while the courts are not active, pretending you are watching an exciting match on the courts, or better yet, bring a tennis racket and play a set or two. Hope you have fun with the fourth in the series.
Oraq qbja gb cvpx hc gur onyy.