The game of tennis has taken Jennifer Itonyo from her native Nigeria to earning All-American honors as a singles and doubles player in college. Today, she coaches budding phenoms and casual players alike at Hampton Tennis Center, where seven clay courts host racket swingers for casual games as well as tournament play. Most students come to her for lessons that help them shore up rickety serves or add oomph to their forehand smashes. Workout-minded players can incorporate vigorous aerobic exercise during cardio tennis lessons for an extra challenge. The center also offers a racket-restringing service, which comes in handy when they get worn out from overuse or overly vigorous air-guitar riffs.