The responsibilities of an assistant tennis coach, under the supervision of the head coach, include organizing and running specific training programs for groups of athletes at varying skill levels. You evaluate the students, plan drills to improve their skills, and prepare them for each tennis match they compete in. Duties include coaching group and one-on-one lessons, and maintaining equipment such as repairing, restringing, and regripping rackets. Some assistant positions are responsible for recruiting new players to a sports academy, interviewing candidates, and evaluating the performance of those who are interested in attending the academy. You are expected to represent your club or athletic department professionally on and off the job. Some employers may require you to write articles for a newsletter or work in the pro shop.