Kazakhstan reached the quarter-finals of the United Cup mixed team tournament with a comfortable win over Greece on Monday as Elena Rybakina defeated Maria Sakkari 6-4 6-3 after Alexander Shevchenko stunned Stefanos Tsitsipas.

Elena Rybakina steered Kazakhstan into the United Cup quarterfinals for the first time with a 6-4, 6-3 win over Maria Sakkari on Monday in Perth, sealing the Group C tie following Alexander Shevchenko’s upset of Stefanos Tsitsipas.

Elena Rybakina marks her United Cup debut by helping Kazakhstan to a 2-1 victory over Spain at the season-opening tournament in Australia.

Elena Rybakina guided Kazakhstan to a 2-1 victory against Spain in her United Cup debut at the RAC Arena in Perth on Friday, and Gao Xinyu stunned Beatriz Haddad Maia in China's victory over Brazil.

Stefanos Tsitsipas slumped to defeat in his first match of the season Monday as the Elena Rybakina-led Kazakhstan upset Greece to surge into the United Cup quarter-finals, while Britain beat Argentina.