Novak Djokovic is one victory away from making history in professional male tennis following a semi-finals victory on Friday. The Serbian native is now set to complete his quest and become the first calendar-year Grand Slam winner in 52 years. Djokovic defeated fourth-seeded Alexander Zverev of Germany during a five-set battle at Flushing Meadows in New York—in which the top-ranked player set to notch a 4–6, 6–2, 6–4, 4–6, 6–2 triumph, making him 27–0 in major championships this season. It takes 28 wins, seven for each at the Australian Open, French Open, Wimbledon, and U.S. Open, to complete a calendar-year Grand Slam. “It’s great for the sport,” Zverev said about Djokovic’s quest. “Nobody thought that anybody would do it again. … I do believe that he will do it.” If Djokovic claims victory over Daniil Medvedev during the U.S. Open finals on Sept. 12, he will earn a place at …