Stefanos Tsitsipas sets up Australian Open semi-final with Rafael Nadal | Sport

Tsitsipas wins 7-5, 4-6, 6-4, 7-6 (2) to reach semi-final The 20-year-old will play Nadal in the last four The nailed-on star of this 2019 Australian Open is the 20-year-old Stefanos Tsitsipas and his