After undergoing yet another surgery on his right knee, Roger Federer hopes to return to the pitch in late summer or early autumn. For the moment, his presence has been confirmed at the Laver Cup – scheduled at the O2 Arena in London at the end of September – and at the ATP in Basel.The last two years have not been easy for the King on a sporting level, having had to deal with a serious knee problem. Suffice it to say that the Swiss champion played just 13 official m …