Roger Federer spoke about Juan Martin del Potro being sidelined with a knee injury.
The Swiss said: "It's not nice to see, you do not want anybody to be hurt and not feeling very good. He's been very important in tennis especially for the Argentineans, for them to see him injured again, for him to feel injured, being injured is a terrible thing.
We all wish him a speedy recovery like I am sure you all want to see him back on the court as well. I was supposed to play him here in Buenos Aires, unfortunately, it did not happen."