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ABOUT PLAY RATES SERVICES CONTACT NEWS More WELCOME TO MIDDLEBURY INDOOR TENNIS ABOUT US Middlebury Indoor Tennis MIT is open seven days a week and provides yearround programs and services for all ages. MIT is owned and operated by the Addison Community Athletics Foundation ACAF. ACAF was established in 2012 to promote athletics and healthful behaviors throughout the region by supporting tennis and other health education programs for youth and adults. The mark of great sportsmen is not how good they are at their best but how good they are at their worst.