Novak Djokovic of Serbia is one of the best tennis players in the world. He has won 68 professional ATP tennis tournaments including 12 Grand Slam championships. Six of his Grand Slam victories came from the Australian Open championships in the city of Melbourne. Chung Hyeon of South Korea has won just one, an ATP tournament for players at the age of 21 and younger last November. Chung started playing tennis at the age of 6. His professional tennis biography said, “Growing up, I looked up to Novak Djokovic because of his fantastic game and mental strength." When Novak Djokovic stepped on the court at the Australian Open Monday against Chung, he did not know that he was about to see a clone of himself. The difficult match lasted three hours and 21 minutes.