Maria Sharapova, Venus Williams among stars who honor science achievement at Breakthrough Prize Ceremony

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.

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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.

When asked, @karenkhachanov joked that Moscow was boring, so Davydenko asked him if he could come with him to D.C. But truth is that they have trained together, and the younger Russian is working on trying to make it more official. https://t.co/NbB4MfLSsd
— Stephanie Myles (@OpenCourt) July 29, 2019

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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.

David Witt, longtime coach of Venus Williams, is now working with Jessica Pegula.
— Ben Rothenberg (@BenRothenberg) July 29, 2019

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

Marco Panichi will replace Gebhard Phil-Gritsch in Djokovic’s team as his new fitness trainer. Panichi previously worked with Novak during parts of 2017 and 2018. #djokovic #novak https://t.co/DY8yZi4fsH
— Saša Ozmo (@ozmo_sasa) July 29, 2019

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

Djokovic, Venus, Sharapova join others with various coaching changes

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