Like sword fighting your grandfather for the head seat at the dinner table, tennis is a game of skill and finesse where love means nothing. Show no mercy with today's Groupon: for $25, you get a two-hour adult group tennis lesson from Tennis on the Lake (a $50 value). This deal is valid at the Waveland Park location.

Tennis on the Lake's two-hour Drop-in Drill & Play classes fine-tune serving and swatting skills with a combination of thorough practice of core techniques and point play. Beginner and intermediate lessons divide time evenly between drills that perfect the form, power, and placement of strokes and point-play sessions that let players unleash newly learned skills and guttural serving howls in a competitive environment. Classes are limited to 6–12 students and begin at 6 p.m. and 8 p.m. on Monday, Wednesday, and Friday, and at 9 a.m. and 11 a.m. on Saturday and Sunday. Scheduling is based on availability and line-judge rulings, so customers should register online to secure a spot.