Novak Djokovic of Serbia plays a backhand during his Men's Singles Semi-final match against Roger Federer of Switzerland on day eleven of the 2020 Australian Open at Melbourne Park | January 30, 2020 | 📷: darriantraynor | #GettySport #tennis #ausopen #melbourne #grandslam #australia #slam #australianopen #NovakDjokovic #australianopen2020 #ausopen2020