by Marty Smith @MartySmithAT Marty Smith is the director of tennis at the New York Athletic Club and the author of the book “The Absolute Tennis: The Best And Next Way To Play The Game” for sale here https://www.amazon.com/dp/1937559742/ref=cm_sw_r_tw_dp_U_x_HLsoAbDGYAW4F Watching the Australian Open on television this week I was struck by how much tennis has changed since […]