Roger Federer will miss the rest of the 2020 season after having a further operation on his right knee. The 20-time Grand Slam winner had the initial arthroscopic surgery in February but said he suffered a setback with his rehabilitation. Professional tennis has been suspended since March because of the coronavirus pandemic. Federer has not played since losing to Novak Djokovic in the Australian Open semi-finals in January. He missed the majority of the 2016 season with a knee injury but returned the following year to win the Australian Open and Wimbledon. The ATP Tour is shut down until at least the end of July because of the pandemic, with the US Open scheduled to start on 31 August and the French Open beginning on 20 September.