TIMELINE: Novak Djokovic's bid to compete at Australian Open

The Australian government on Friday revoked tennis star Novak Djokovic's visa for a second time, just three days before the Australian Open begins.

Djokovic’s lawyers are expected to appeal the cancellation in the Federal Circuit and Family Court, as they successfully did the first time.

Melbourne-based immigration lawyer Kian Bone said that Djokovic’s lawyers face an “extremely difficult” task to get court orders over the weekend to allow their client to play next week.

His exemption from a COVID-19 vaccination requirement to compete was approved by the Victoria state government and Tennis Australia, which apparently allowed him to receive a visa to travel.

Here is a look at the timeline of events involving Djokovic's trip to Australia:

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April 2020: As the coronavirus pandemic rages, Djokovic issues a statement, saying, “Personally I am opposed to the vaccination against COVID-19 in order to be able to travel. But if it becomes compulsory, I will have to make a decision whether to do it, or not.”

June 2020: With the professional tennis tours on hiatus because of the pandemic, Djokovic organizes a series of exhibition matches in Serbia and Croatia with no rules requiring social distancing or masking. The Adria Tour is called off after some players get COVID-19; Djokovic and his wife, Jelena, test positive.

Nov. 19, 2021: Confirming an edict made by the Victorian state government in late October, tournament director Craig Tiley says everyone at the 2022 Australian Open must be vaccinated for COVID-19. Djokovic's vaccine status is unknown at the time.

Dec. 8, 2021: Victoria state Deputy Premier James Merlino says medical exemptions for the vaccine policy would not be “a loophole for privileged tennis players” and would only be possible in “exceptional circumstances, if you have an acute medical condition.”

Dec. 14, 2021: Djokovic attends a professional basketball game in Belgrade and is photographed hugging several players from both teams, including some who later tested positive.

Dec. 16, 2021: Djokovic tests positive for COVID-19 in Serbia, although that is not public knowledge until revealed by court documents in January. He later says he did not know the result until Dec. 17.

Dec. 17, 2021: Djokovic attends an event in Belgrade honoring youth tennis players. Parents post photos on social media showing Djokovic and the young players without masks. Djokovic later says he was asymptomatic, took an antigen test before the event that showed he was negative, and only received the positive PCR result after the event.

Dec. 18, 2021: Knowing he tested positive, Djokovic does an interview and photo shoot with the French newspaper L'Equipe. He acknowledges weeks later: “On reflection, this was an error of judgement.”

Dec. 22, 2021: According to court documents, Djokovic tests negative for COVID-19 in Serbia.

Dec. 29, 2021: Djokovic withdraws from Serbia's team for the ATP Cup, days before the competition is due to begin in Sydney. No reason is given.

Jan. 1, 2022: Tiley is asked in a TV interview about Djokovic's status for the Australian Open and responds: “There’s quite a bit to play out and I think it will play out in the coming days.”

Jan. 4, 2022:

Jan. 5, 2022: Djokovic arrives at Melbourne Tullamarine Airport.

Jan. 6, 2022: After being detained for about eight hours upon arrival, Djokovic is denied entry to the country and his visa is canceled. He is sent to an immigration hotel, where he remains for four nights. The Australian Border Force says Djokovic failed to meet entry requirements. Australian Prime Minister Scott Morrison tweets: “Rules are rules, especially when it comes to our borders.”

Jan. 10, 2022:

Jan. 11, 2022: With his status still uncertain, Djokovic is installed as the No. 1 seed for the men's field at the Australian Open. The tournament strictly follows the current rankings in determining seedings and Djokovic is ranked No. 1; he has spent more weeks atop the ATP than any other man in the history of the men's professional tour's computerized rankings.

Jan. 12, 2022: Djokovic's

Jan. 13, 2022: Djokovic is included in the Australian Open draw. He is slated to play fellow Serb Miomir Kecmanovic in the opening round next week.

Jan. 14, 2022:

Jan. 17, 2022: Play is scheduled to begin at Melbourne Park. The men's singles final is Jan. 30.

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