(200130) -- MELBOURNE, Jan. 30, 2020 (Xinhua) -- Roger Federer of Switzerland speaks at the post-match press conference after the men's singles semifinal match against Novak Djokovic of Serbia at the Australian Open tennis tournament in Melbourne, Australia on Jan. 30, 2020., Image: 495602368, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Bai Xue / Xinhua News / Profimedia

Roger Federer and Novak Djokovic Nitto ATP Finals, Tennis, London, UK - 14 Nov 2019 Roger Federer (SUI) during his third round robin match against Serbian player Novak Djokovic (SRB) in London, O2 Arena., Image: 483012755, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Isopix / Shutterstock Editorial / Profimedia