 Greek Stefanos Tsitsipas, the No 3 seed, advanced to the last four of the Australian Open by defeating Czech Jiri Lehecka 6-3, 7-6 2, 6-4 at Melbourne Park on Tuesday. Tsitsipas, ranked No 4, will play Russian Karen Khachanov, the No 18 seed, next. The Greek won against Frenchman Quentin Halys 6-3, 6-4, 7-6 6, ... Tsitsipas books spot in last four... 