STEFANOS TSITSIPAS maintained his unbeaten record in grand slam quarter-finals with victory over Jiri Lehecka to reach the last four at the Australian Open.

The third seed made it six from six in the last eight at majors with a 6-3 7-6 (2) 6-4 victory over 21-year-old Lehecka, who had never won a grand slam match before arriving in Australia.

The young Czech had defeated Cameron Norrie and Felix Auger-Aliassime to make the last eight but was broken in his first service game and, although he put on a creditable display, it was not enough to take a set from Tsitsipas.