Nikola Pilic was touched by the wonderful gesture Novak Djokovic did at the Serbia Open as he called the Serb as “the greatest player of all time.” Pilic, one of the first coaches to work with Djokovic, took part in a special ceremony that took place after the Serbia Open final in Belgrade. While Pilic was making his way onto the court, Djokovic called him his “tennis father” and gave him a strong hug. Also, Djokovic handed Pilic a gift box, showing the appreciation and respect he has for his former coach. “I do not know what to …