Djokovic, Venus, Sharapova join others with various coaching changes

Djokovic, Venus, Sharapova join others with various coaching changes

Grand Slam champions Angelique Kerber and Garbine Muguruza have yet to announce their respective new coaches.

The hard-court events are beginning with a slew of unusual mid-season coaching changes.

Maria Sharapova, who has been on and off the tour with a shoulder injury, has spent two weeks training at the Riccardo Piatti tennis center in Italy, working with the experienced coach on her game. 

Russia's Karen Khachanov, who has been asking Nikolay Davydenko to join his team, has the former Top 5 player accompanying him in Washington, D.C., this week. The pair do not yet have a formal arrangement. 

Eugenie Bouchard, who fell in the first round of Washington, was playing her first event with new coach Jorge Todero. The pair also trained together in Florida beforehand, according to TVA.

Venus Williams's former coach, David Witt, is now working with Jessica Pegula. 

Novak Djokovic has changed his trainer, bringing in Marco Panichi again instead of Gebhard Phil-Gritsch.

Angelique Kerber and Garbine Muguruza have recently announced they were splitting with their coaches. Neither has announced a new coach.