Garbine Muguruza of Spain in action against Tereza Martincova of the Czech Republic during their women’s second round match at the Kremlin Cup tennis tournament in Moscow, Russia, 20 October 2021. EPA-EFE/SERGEI ILNITSKYTommy Paul of US in action during the men’s second round match against Marin Cilic of Croatia at the Kremlin Cup tennis tournament in Moscow, Russia, 20 October 2021. EPA-EFE/SERGEI ILNITSKYAjla Tomljanovic of Australia reacts during her women’s second round match Aryna Sabalenka of Belarus at the Kremlin Cup tennis tournament in Moscow, Russia, 20 October 2021. EPA-EFE/SERGEI ILNITSKYMarin Cilic of Croatia in action during the men’s second round match against Tommy Paul of US at the Kremlin Cup tennis tournament in Moscow, Russia, 20 October 2021. EPA-EFE/SERGEI ILNITSKYAnna Kalinskaya of Russia in action during the women’s second round match against Maria Sakkari of Greece at the Kremlin Cup tennis tournament in Moscow, Russia, 21 October 2021. EPA-EFE/YURI KOCHETKOVAndrea Petkovic of Germany in action during the women’s second round match against Anett Kontaveit of Estonia at the Kremlin Cup tennis tournament in Moscow, Russia, 21 October 2021. EPA-EFE/YURI KOCHETKOVMaria Sakkari of Greece in action during the women’s second round match against Anna Kalinskaya of Russia at the Kremlin Cup tennis tournament in Moscow, Russia, 21 October 2021. EPA-EFE/YURI KOCHETKOVAnett Kontaveit of Estonia in action during the women’s second round match against Andrea Petkovic of Germany at the Kremlin Cup tennis tournament in Moscow, Russia, 21 October 2021. EPA-EFE/YURI KOCHETKOVTereza Martincova of the Czech Republic reacts during her women’s second round match against Garbine Muguruza of Spain at the Kremlin Cup tennis tournament in Moscow, Russia, 20 October 2021. EPA-EFE/SERGEI ILNITSKYAryna Sabalenka of Belarus in action against Ajla Tomljanovic of Australia during their women’s second round match at the Kremlin Cup tennis tournament in Moscow, Russia, 20 October 2021. EPA-EFE/SERGEI ILNITSKY