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Greater Madison Tennis Association GMTA is a nonprofit organization promoting tennis in Madison for over 35 years. Help Support Madison Tennis. Junior Membership 5 yr Individual Membership 15 yr Family Membership 20 yr JOIN Programs for Juniors Adults The Greater Madison Tennis Association GMTA consists of tennis enthusiasts from the Madison Wisconsin area. GMTA a nonprofit organization has been active in Madison for over 35 years and has over 300 members.