After playing in the quarter-finals at Wimbledon last year, Roger Federer has decided to undergo a new surgery to try to fix or at least improve the condition of his right knee. The defeat against Hubert Hurkacz on the lawns of the All England Club remains the last official match played by Federer on the major circuit; game in which the Swiss appeared in great difficulty from a physical point of view. However, the Swiss has no intention of leaving tennis in this way and, in recent weeks, has returned to training in the gym. The 20-time Grand Slam champion also announced that he will …