Nadal is gunning for a record 21st Grand Slam title.
The defending champion required treatment before defeating Taylor Fritz on Friday.
The state of Victoria will enter a five-day emergency lockdown after fresh cases of COVID-19 were detected.
Melbourne locals are still being cautious despite being allowed back to watch the Australian Open live.
The 33-year-old fully believes that he caught the novel coronavirus over the holiday season, as he spent time training at the LTA's high performance centre in London.
The mandatory two-week quarantine period is about to come to an end amid mixed sentiments from players.
Andy Murray also tested positive and was unable to fly to Australia along with the other participants.
It is not looking likely that Murray will recover in time to make it to Australia and complete a 14-day quarantine.
The 39-year old former world number one hasn't won a Grand Slam title since the Australian Open in 2017.
Players at the Prague Open are advised to stay isolated and not to shake hands with each other during and after their matches.
She became world number one in 2005, at the age of 18, and won the US Open the next year.
The Serbian star now has 17 Grand Slam titles under his belt.
Thiem is attempting to secure his first Grand Slam title.
After beating Zverev in the semi-final, Thiem became the first Austrian man to reach the Australian Open final
Rod Laver Arena's roof was closed to combat severe weather conditions
The Serb is aiming to win his 17th Grand Slam title after he stormed into the final, where he will face either Thiem or Zverev
Either Thiem or Zverev will face Federer or Djokovic in the Australian Open 2020 Final
The 16-time Grand Slam winner is aiming to lift his 8th Australian Open title
The six-time champion's reward is a showdown against either long-time rival Novak Djokovic or big-serving Canadian Milos Raonic.
The two-time Grand Slam champion defeated 16th seed Elise Mertens 6-4, 6-4.
Williams has to wait longer to win her 24th Gram Slam title and equal Margaret Court's tally
Dirty rain overnight caused a layer of mud to build on the outside courts in Melbourne Park.
