Australian Open: ‘truly unbelievable’ Tsitsipas stuns Sinner to progress to semi-finals, as Iga Swiatek wins heated three hour battle

• Stefanos Tsitsipas pulled out one of his best performances yet to book his spot in the Australian Open semi-final
• Iga Swiatek took three hours in the blistering afternoon heat to overcome Kaia Kanepi – ‘this match was crazy’