Djokovic has declined to disclose whether he is vaccinated, citing privacy.
It was Novak Djokovic's first match this year after his Australian Open hopes were dashed when he was deported following an 11-day saga revolving around his decision not to have a COVID-19 vaccination.
Serum CEO Adar Poonawalla posted a video of him playing tennis, with a message for the unvaccinated Novak Djokovic.
World No 1 Djokovic on Sunday won his sixth Wimbledon title. With this win, Djokovic now has 20 Grand Slams to his name and he is now equal with Swiss tennis maestro Roger Federer and Nadal.
Roger Federer paid tribute to his retiring rival Rafael Nadal on Tuesday, telling the Spaniard he challenged him like no other player.
Djokovic has refused to take the vaccine and appears set to miss out on the year's last Grand Slam
World number one Novak Djokovic was released from Australian immigration detention on Monday after winning a court challenge to revive his bid to win a record 21st Grand Slam title at the upcoming Australian Open.
Images from Day 3 of the 2022 Wimbledon Championships at the All England Lawn Tennis and Croquet Club in London, on Wednesday.
All the action from Day 4 at the Australian Open on Wednesday
At one stage, police deployed pepper spray.
Italy's Sinner and Spain's Alcaraz have won two Grand Slams each this year, with Alcaraz beating Sinner in closely fought clashes at the French Open semi-finals and the China Open final.
Novak Djokovic is still uncertain whether he will take part in the 2022 Australian Open but will soon make a decision, the World No 1 said after Serbia's 2-1 defeat by Croatia in the Davis Cup semi-finals on Friday.
Djokovic welcome to play if he can obtain visa, says Australian Open director
Sinner won in Cincinnati this week to claim his fifth title of a breakout season before the revelation that he avoided a ban over two positive tests
'I'm not vaccinated and I'm not planning to get vaccinated so the only good news I can have is them removing the mandated green vaccine card'
Djokovic, who has won nine titles at Melbourne Park, including the last three, confirmed on Tuesday that had received a vaccination exemption to allow him to bid for a record 21st major title at the Australian Open, which starts on January 17.
It took the COVID-19 pandemic to put a brake on Djokovic's 18-match unbeaten run in 2020, as he won the ATP Cup with Serbia, an eighth Australian Open title and a fifth Dubai Tennis Championships before the season came to a halt in early March.
Unvaccinated tennis star Novak Djokovic won the right to take his fight against deportation from Australia to a Federal Court on Saturday after the government cancelled his visa for the second time over COVID-19 entry regulations.
He was drawn in the toughest half of the draw with Nadal as well as in-form Spanish teenager Carlos Alcaraz and world number three Alexander Zverev, who could clash in the last eight.
Jannik Sinner became the first Italian to win the ATP Finals title following a dominant 6-4, 6-4 victory over American Taylor Fritz.
World number one Novak Djokovic once again declined to reveal whether he has been vaccinated against COVID-19 and said he is unsure if he would defend his title at next year's Australian Open.
A round-up of all tennis action on Friday.
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Images from the French Open quarter-final between Rafael Nadal and Novak Djokovic at Roland Garros on Tuesday.
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A true legend of the game who paved the way and taught so many of us how to be as a player and as a person.
Images from Day 6 of the 2023 Australian Open at Melbourne Park on Saturday.
Images from Day 6 at the French Open, at Roland Garros, in Paris, on Friday.
Carlos Alcaraz announced himself in Madrid when he played with a sore ankle but still dispatched three top five players -- Rafael Nadal, Djokovic and Alexander Zverev -- en route to his second Masters title, just days after his 19th birthday.
The company is developing a peptide, which inhibits the coronavirus from infecting the human cell, expects to launch clinical trials in Britain this summer, he added.
Serbia's parliamentary speaker, Ivica Dacic, said on Monday he is concerned tennis star Novak Djokovic could still be deported from Australia despite winning his court case over his visa and vaccination exemption.
Djokovic had been favourite to win a 10th title at Melbourne Park and claim a 21st Grand Slam crown but the Serb now faces being deported from Australia.
American great Pete Sampras said he does not expect any player to match Novak Djokovic's feat of winning the men's year-end world number one ranking seven times.
Djokovic will be nowhere near the centre court after losing his bid to overturn a second visa cancellation.
Andy Murray's illustrious career finally came to an end as he and doubles partner Dan Evans were beaten 6-2, 6-4 by American pair Taylor Fritz and Tommy Paul in the Olympics quarter-finals at Roland Garros on Thursday.
Images from the men's singles action at the US Open on Sunday.
Australian authorities scrambled on Sunday to file a legal defence of their decision to bar entry to tennis world number one Novak Djokovic over his COVID-19 vaccination status, as the Serbian superstar spent his fourth day in immigration detention.
The Serbian Wimbledon champion extended his win streak to nine, wrapping up the final in 75 minutes without facing a break point and booked his place at next month's ATP Finals.
The reaction has been swift across the world to Novak Djokovic's visa has been cancelled for a second time by the Australian government.
Djokovic did not drop a set en route to the final in Rome