World number one tennis player Novak Djokovic has returned back to training after recovering from COVID-19. Boris Bosnjakovic, the head coach of Novak Tennis Centre in Belgrade, took to social media platform Instagram to post photographs of the Serbian ace going about his business along with Filip Krajinovic.

Novak Djokovic back in training after COVID-19 recovery ahead of US Open

He may be a 17-time grand slam champion, world number 1 and on-course to become the most successful men's tennis player of all time. But Novak Djokovic's stock has taken a real pounding during the COVID-19 pandemic.

Adria Tour: Latest series of gaffes from Novak Djokovic

In another major blow to the tennis world, Serbian ace Novak Djokovic has tested positive for coronavirus. Djokovic's results follow after Boran Coric and Grigor Dimitrov following the completion of the first leg of Adria Tour last week in the Balkans.

Serbian tennis ace Novak Djokovic tests positive for COVID-19