Professional and Experienced Tennis Coaching For All Ages & Levels.Nathan's Tennis at Gannons' is owned and operated by husband and wife, Nathan and Mary-Jane Murray. At 23 years of age, Nathan has already achieved for himself his HSC, a Certificate 3 and Diploma in Early Childhood Education, a Certificate 3 in sports coaching and is a fully Qualified Tennis Australia Junior Development Coach after completion of a 12 month full-time course.