The USTA says it hopes to have a replacement picked by November.
The Bulgarian's footwork is nothing short of sublime on this stellar point against Lucas Pouille in Beijing.
The Frenchmen tried but fell 34 strokes short of their all-time record.
Former No. 1 to play WTT Smash Hits in Las Vegas Monday night.
Swiss Maesto is style master at Chanel show in Paris.
All eight doubles teams are set for this year's WTA Finals in Singapore.
Dominika Cibulkova also offers view on Russian's return.
