Help Your Child Score Big with Tennis Whizz. Tennis Whizz is a complete preschool tennis program that fosters the healthy mental, physical and emotional growth of children ages 5 and under. While we cannot promise which preschoolers will continue on to become championship tennis players, we are 100% committed to helping our Whizz kids develop fundamental tennis skills, a love of the game, physical dexterity and even early literacy and math skills! Tennis Whizz is available at all SPORTIME Tennis locations. Click here for additional program information.