Gifted a double free pass into the Australian Open semi-finals, Novak Djokovic is under no illusions that he still faces the greatest challenge in tennis to capture a record-breaking 25th grand slam singles crown. "He's just playing on such a high level right now," Djokovic said ahead of his mind-blowing 55th grand slam semi-final and 13th in Australia. Djokovic knows he's had a charmed run, some blessed fortune he probably needs while pursuing grand slam No.25 at almost 39 years of age. "It's a grand slam, it's always very difficult against Novak. 2-JANNIK SINNER (ITA) leads 4-NOVAK DJOKOVIC (SRB) 6-42025 Wimbledon, grass, SF, Sinner 6-3 6-3 6-42025 French Open, clay, SF, Sinner 6-4 7-5 7-6 (7-3)2024 Shanghai Masters, hard, F, Sinner 7-6 (7-4) 6-32024 Australian Open, hard, SF, Sinner 6-1 6-2 6-7 (6-8) 6-32024 Davis Cup, hard, SF, Sinner 6-2 2-6 7-52023 ATP Finals, hard, F, Djokovic 6-3 6-32023 ATP Finals, hard, RR, Sinner 7-5 6-7 (5-7) 7-6 (7-2)2023 Wimbledon, grass, SF, Djokovic 6-3 6-4 7-6 (7-4)2022 Wimbledon, grass, QF, Djokovic 5-7 2-6 6-3 6-2 6-22021 Monte Carlo Masters, clay, R32, Djokovic 6-4 6-2