Wednesday, 19 February 2020

Serbia's Novak Djokovic reacts during his match against Germany's Jan-Lennard Struff in Australian Open First Round at Melbourne Park, Australia, January 20, 2020. Novak Djokovic was forced to work hard by unwavering German Jan-Lennard Struff in his first match of the Australian Open on Monday before prevailing 7-6(5) 6-2 2-6 6-1 to stay on course for a record-extending eighth title at Melbourne Park. REUTERS/Kai Pfaffenbach

Serbia's Novak Djokovic in action during his match against Germany's Jan-Lennard Struff in Australian Open First Round at Melbourne Park, Australia, January 20, 2020. REUTERS/Issei Kato

Serbia's Novak Djokovic in action during his match against Germany's Jan-Lennard Struff in Australian Open First Round at Melbourne Park, Australia, January 20, 2020. REUTERS/Kai Pfaffenbach

Serbia's Novak Djokovic in action during his match against Germany's Jan-Lennard Struff in Australian Open First Round at Melbourne Park, Australia, January 20, 2020. REUTERS/Issei Kato

Serbia's Novak Djokovic in action during his match against Germany's Jan-Lennard Struff in Australian Open First Round at Melbourne Park, Australia, January 20, 2020. REUTERS/Kai Pfaffenbach

Serbia's Novak Djokovic celebrates after winning his match against Germany's Jan-Lennard Struff in Australian Open First Round at Melbourne Park, Australia, January 20, 2020. REUTERS/Kai Pfaffenbach