Professional tennis serves reach velocities unseen in most other sports, aside from fighter-jet racing and subatomic particle ping-pong. Crush an ace out wide with today’s Groupon: for $40, you get a one-hour private or semi-private tennis lesson from tennis director Rick Kepler at Seascape Sports Club (up to a $90 value).

A member of the U.S. Professional Tennis Association, Rick Kepler imparts hard-won racket tactics to help players of all abilities improve their game. Receive Kepler’s sage serve, volley, and groundstroke wisdom in a one-person private lesson, or opt to learn alongside a fellow athlete in a two-person tutorial. Beginners can learn the basic low-to-high groundstroke mechanics, and more advanced acers may dedicate a constructive hour to topspin lobs, pinpoint passing shots, serve-and-volley strategy, or how to hypnotize ball boys. Situated south of Santa Cruz, Seascape Sports Club’s tennis complex boasts 12 regulation tennis courts, including a clay court, seven lighted courts, and a stadium center court.