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

The Serbian was trailing by two sets to love when the unfortunate Lorenzo Musetti was forced to withdraw with a thigh injury.

Italian Musetti suffered a right thigh problem and was unable to complete the match, despite leading by two sets to love.

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 two-time defending champion maintained his perfect record against fellow Italians with victory over Luciano Darderi.

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

No other injuries were reported.

Djokovic defeated fourth seed Taylor Fritz in a tense quarter-final.

Djokovic struggled in the second set of his 6-1 7-6 (3) 6-2 victory.

The 38-year-old suffered a nasty fall late in his quarter-final win on Wednesday.

Alcaraz dropped another set as he reached the last eight.

It is an intriguing showdown between the two bright young things who have won the last five grand slams between them.

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

The fifth seed recovered from two sets to one down to reach round two.

Sinner beat Daniil Medvedev in the quarter-final with a 6-2 1-6 6-1 6-4 win.

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

The two-time major winner dropped just four games against American Wolf.

The 22-year-old Italian followed up his victory over Novak Djokovic by claiming the trophy in dramatic fashion.

Djokovic had to save four set points on his serve to avoid falling 2-1 down to home favourite Alexei Popyrin on Rod Laver Arena.