In his 2013 book 'Serve to Win', Djokovic explains that he practices mindfulness meditation for 15 minutes every day. Mindfulness is a way of paying attention to your experience as it happens without judgment.
So let me just say thank you US Open officials for everything you have done. And thank you CBS for pushing the officials to keep to their primetime schedule and getting such great ratings. I've even started playing tennis.
Nadal and Djokovic have effectively threatened the brilliance of mental acuity and shot-making, exemplified by more cerebral players like Federer and Murray, who favor tactics and touch over drawing errors while running down and wearing out opponents.