The event may not happen in 2019 as protests have shook the region all summer.
The World No.1 pulled out of the US Open with a left shoulder injury, but plans to play rejoin the tour this autumn.
The Greek has set his goals for the remainder of the 2019 season.
Juan Martin del Potro took to the court for the first time since undergoing surgery on his right knee in June.
Former world No. 12 could return as soon as next month.
The Aussie will rejoin Halep's team as her full-time coach in 2020.
Martina Navratilova plays pivotal role in new Netflix series.
