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.
Uncle Toni on what distinguishes Daniil Medvedev from other NextGen stars.
Former No. 1 will play Asian swing.
Becker, Lendl, McEnroe and Wilander reveal today's pros who remind them of themselves.
