He defeated Jiri Lehecka in straight sets.
Stefanos Tsitsipas has made it to the semi-finals of the men's singles at the Australian Open in Melbourne.
The Greek third seed defeated Czech player Jiri Lehecka in straight sets - 6-3, 7-6, 6-4.
Tsitsipas will face Russia's Karen Khachanov in the last four.
He held a 2 set advantage over American Sebastian Korda before Korda retired due to injury.
In the women's singles, two-time champion Elena Rybakina is into the semi finals after a straight sets defeat of Jelena Ostapenko.
The reigning Wimbledon champion will now face two-time winner Victoria Azarenka - who overcame third seed Jessica Pegula 6-4, 6-1.
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