Stefanos Tsitsipas defeated Jiri Lehecka in straight sets to set up an Australian Open semi-final with Karen Khachanov. [Source: BBC Sport]

Stefanos Tsitsipas defeated Jiri Lehecka in straight sets to set up an Australian Open semi-final with Karen Khachanov.

Greek third seed Tsitsipas reached his fourth Melbourne semi-final in five years with a 6-3 7-6 (7-2) 6-4 win.

Lehecka, of the Czech Republic, had been one of the surprise packages of the tournament having beaten two top-12 seeds to make the quarter-finals.

The 21-year-old had previously never won a Grand Slam match.