Novak Djokovic v Alexander Zverev LIVE: Australian Open score and updates from semi-final clash

Novak Djokovic battles Alexander Zverev for a place in the Australian Open final as the 37-year-old continues his bid to become the oldest men’s grand slam champion of all time in Melbourne.

The 37-year-old Djokovic defied injury to defeat young rival Carlos Alcaraz in the quarter-finals and his path to a record 25th grand slam singles title does not get any easier as he faces the big-serving Zverev, who is also the tournament’s second seed.

Djokovic admitted he was “concerned” by his physical condition after struggling with a left leg injury against Alcaraz on Tuesday, and the Serbian was forced to skip training on Wednesday and Thursday before his playing his 12th Australian Open semi-final.

Zverev, meanwhile, is aiming to win his first grand slam title and the German has been on strong form this fortnight. The 27-year-old has lost five of his last six grand slam semi-finals, though, but will fancy his chances if Djokovic is physically compromised.

Later, Jannik Sinner squares off against Ben Shelton in the second of the men’s singles semi-finals, as the World No 1 and reigning champion continues his title defence against the big-serving American.

Follow the latest updates from the Australian Open semi-finals in our live blog below:

Djokovic v Zverev - Australian Open live updates

• Novak Djokovic battles Alexander Zverev in Australian Open semi-finals, from 3:30am GMT

• Djokovic plays 50th grand slam semi-final and bidding for record 25th grand slam title

• Second seed Zverev has been on strong form in quest for first grand slam title

• Defending champion Jannik Sinner plays Ben Shelton in second semi-final

• Madison Keys to play defending champion Aryna Sabalenka in women's singles final tomorrow