The Kremlin Cup
is a professional tennis tournament played on indoor hard courts. It is currently part of the ATP Tour 250 series of the ATP Tour and is a Premier Tournament on the WTA Tour. It was held annually at the Olympic Stadium in Moscow, Russia, from 1990 to 2018. In 2019, the Olympic Stadium underwent a major reconstruction lasting two years. The 2019 edition of the tournament was held at the Ice Palace Krylatskoye. In 2021, the Kremlin Cup will be played at the Irina Viner-Usmanova Gymnastics Palace and the Luzhniki Palace of Sports.