Argentine tennis player Francisco Cerundolo admitted that he was impressed after seeing Novak Djokovic in person for the first time. Cerundolo, 23, competed last year at the Serbian Open in Belgrade. Djokovic, a 20-time Grand Slam champion, also competed in Belgrade the week before the French Open.”Last year I played the final in Buenos Aires, and then I traveled to Europe. Three weeks have passed and I have played the Serbian Open. I’m in the gym and suddenly Novak comes in, whom I’ve never seen live in my life as a player,” Cerundolo said.A month and a half before arriving in Belgrade, Cerundolo got his first ATP title in Buenos Aires. When Djokovic ran into Cerundolo, he was very friendly and congratulated the Argentine for winning Bueno …