In this photo taken June 18, 2020, former Wimbledon champion Goran Ivanisevic, left, who now coaches top-ranked Novak Djokovic, right, attends a training session during an exhibition tournament in Zadar, Croatia. The Croatian great, who won his only Grand Slam title at the All England Club in 2001, wrote on Instagram that he tested positive for coronavirus after two negative tests in the last 10 days. (AP Photo/Zvonko Kucelin)
