"You get in this spiral of negative thoughts and you are really harsh to yourself, you beat yourself up," the world No. 21 said in Beijing.
The birthday girl might need a new Babolat Pure Drive for a present this year.
The Djokovic brothers channeled the Bryan brothers during their first-round win in Beijing.
After a first-round loss Slovakia's Martin Klizan complained about Beijing's smog.
See Young finish an electrifying sprint with a sweeping forehand winner.
Cypriot shows mobility and ingenuity with this running pass.
The Bulgarian couldn't convert break points and by the end of his loss to Benoit Paire he had nothing left to give.