Tsitsipas for Melbourne lockdown: Focused on my goal, I can adapt to any changes

Stefanos Tsitsipas of Greece hits a return to Mikael Ymer of Sweden during their third round match at the Australian Open, Melbourne. Source: AAP Image/EPA/JASON O'BRIEN

Greek tennis star Stefanos Tsitsipas faces tonight at Rod laver Arena Italian Matteo Berrettini in Round 4 of the Australian Open

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Matteo Berrettini of Italy hits a return to Karen Khachanov of Russia during their third round match at the Australian Open, Melbourne. Source: AAP Image/EPA/JASON O'BRIEN