Roger Federer has played a very marginal role in the past two years. The Swiss had to deal with a serious right knee injury, which significantly limited his appearances on the pitch. Suffice it to say that the 40-year-old from Basel played just 13 official matches in 2021, collecting nine wins and four losses.Wimbledon and the Tokyo Olympics were his main goals, but the King never managed to find the ideal condition. After a stark defeat to Hubert Hurkacz in the quarter-finals in London, the former world number 1 announced that he had suffered a knee relapse and had to undergo surgery for the third time in 18 months.The 20-time Grand Slam champion therefore had to give up his last Olympics. Federer hopes to return to the pitch in late summer or early autumn, perhaps for the Laver Cup …