With all of Melbourne's matches canceled on Thursday in light of an unexpected COVID-19 case, players were forced to adjust their plans. For 160 of them, it meant a day of testing and subsequent isolation as a result of staying at the Grand Hyatt during their latest quarantine.

The person testing positive was a hotel worker, who developed symptoms after the quarantine period ended. Players, coaches and staff were deemed "casual' contacts and will be permitted to get back to tennis activities after producing a negative test.

Here are the Top 5 photos from Thursday. (All photos by Getty Images)

1

Guido Pella chats with former player Andre Sa, who currently serves as Head of Player Liaison at Tennis Australia. Pella's hard quarantine was followed up by a tough opening match at the ATP Cup, where he lost to Andrey Rublev, 6-1, 6-2, on Monday.

Top 5 Photos 2/4: 
160 players tested 
as "casual" contacts

Top 5 Photos 2/4: 160 players tested as "casual" contacts

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2

Maria Sakkari is spotted with her coach Tom Hill. The Greek enjoyed a stellar start the year, defeating Garbine Muguruza and Sofia Kenin en route to the Abu Dhabi semifinals.

Top 5 Photos 2/4: 
160 players tested 
as "casual" contacts

Top 5 Photos 2/4: 160 players tested as "casual" contacts

3

Sakkari's countryman Stefanos Tsitsipas is seen exiting the Grand Hyatt. The previous night, Tsitsipas won his 2021 season opener over Alex de Minaur at the ATP Cup and is expected to take on Rafael Nadal when the event resumes.

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Top 5 Photos 2/4: 
160 players tested 
as "casual" contacts

Top 5 Photos 2/4: 160 players tested as "casual" contacts

4

A look at one of the groups waiting for their turn. A total of 507 personnel were due to go through the testing process.

Top 5 Photos 2/4: 
160 players tested 
as "casual" contacts

Top 5 Photos 2/4: 160 players tested as "casual" contacts

Advertising

5

Leylah Fernandez was among the competitors cleared to train at Melbourne Park. The 18-year-old defeated Sloane Stephens for the third time in less than a year at the Grampians Trophy, the extra WTA event created for players who emerged from hard lockdown.

Top 5 Photos 2/4: 
160 players tested 
as "casual" contacts

Top 5 Photos 2/4: 160 players tested as "casual" contacts