The world number one battled past Alexander Zverev in five hours and 27 minutes to reach the Australian Open final.

The world number one appeared to suffer from cramp but recovered to win after five hours and 27 minutes.

The world number one is still yet to drop a set after beating Australian De Minaur 7-5 6-2 6-1.

Zverev moved through to the semi-finals with a 6-3 6-7 (5) 6-1 7-6 (3) victory.

The world number one is yet to drop a set at Melbourne Park.

The 37-year-old’s fitness had been in doubt ahead of his last-four clash with Alexander Zverev at the Australian Open.

The match assures a home player in the men’s final since Andy Roddick lost to Roger Federer 18 years ago.