It's men's semi-final day at the Australian Open and there has already been a dramamtic development. Alexander Zverev is into the final after Novak Djokovic retired hurt at the Rod Laver Arena, moments after the German had taken the first set 7-6.

It means that Djokovic's dream of a 25th Grand Slam is over, with Zrevev just a win away now from his long-awaited first major title. The 27-year-old will now meet Jannik Sinner or Ben Shelton in the final on Sunday.

Before that, Aryna Sabalenka will aim for a third straight title at Melbourne Park when she takes on Madison Keys in the women's final on Saturday. The Belarusian and world No.1 will go in as heavy favourite, with Keys appearing in just her second Slam final after stunning Iga Swiatek on Thursday.

Express Sport brings you all the latest Australian Open news and updates...