It’s that time of year again when tennis descends on New York City...

While qualifying began Tuesday at the US Open, a few of the sport’s premier players put in the work on the practice courts. Fans will pack the New York major when it kicks off next Monday, but until then, competitors will find themselves in a quiet atmosphere.

The grounds are closed to the public this week due to COVID-19 protocols. Here's a look at some of the stars spotted at Flushing Meadows.

Fútbol, anyone? World No. 1 Novak Djokovic was in the mood for some.

Fútbol, anyone? World No. 1 Novak Djokovic was in the mood for some.

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After pulling out of Cincinnati with a "small tear" to her right adductor, Simona Halep hit the courts for a trial run.

After pulling out of Cincinnati with a "small tear" to her right adductor, Simona Halep hit the courts for a trial run.

Countrymen Karen Khachanov and Daniil Medvedev enjoy a lighter moment.

Countrymen Karen Khachanov and Daniil Medvedev enjoy a lighter moment.

Practice doesn't have to be all about work. Case in point: newly-minted world No. 2 Aryna Sabalenka.

Practice doesn't have to be all about work. Case in point: newly-minted world No. 2 Aryna Sabalenka.