We know very well that Novak Djokovic he likes challenges. The Serb did not want to miss the challenge started a few hours ago by Roger Federer, a challenge in order to liven up the quarantine and encouraging everyone to stay home. The Serb replied to Roger tapping the wall with his racket very close, through his Instagram account. Of course … this time there was no hat. A sample of good vibes more, for a good cause, between two historical racquets.