IMAGE: Alexander Zverev smashed his racket against the umpire's chair at last month's ATP 500 event in Acapulco, for which he was expelled from the tournament. Photograph: Mackenzie Sweetnam/Getty......
IMAGE: Germany's Alexander Zverev hits the umpire's chair with his racket after his double match against Britain's Lloyd Glasspool and Finland's Harri Heliovaara. Photograph: Abierto Mexico......
IMAGE: Serbia's Novak Djokovic looks dejected after he lost his quarter final match against Czech Republic's Jiri Vesely. Photograph: Suhaib Salem/Reuters World number one Novak Djokovic......
IMAGE: Serbia's Novak Djokovic celebrates winning his second round match against Russia's Karen Khachanov. Photograph: Suhaib Salem/Reuters World number one Novak Djokovic impressed again at......
IMAGE: The ATP in October last year also launched an internal investigation into allegations of domestic abuse against Alexander Zverev, by his ex-girlfriend Olga Sharypova. Photograph: Scott......