MELBOURNE (REUTERS) - World No. 1 Ashleigh Barty will join Serena Williams, Rafael Nadal and Novak Djokovic in playing a pre-Australian Open exhibition event in Adelaide at the end of the month, organisers confirmed on Thursday (Jan 21).

US Open winners Dominic Thiem and Naomi Osaka and women's No. 2 Simona Halep will be part of the eight-player field, which also includes 19-year-old Italian Jannik Sinner.

The Adelaide event, dubbed "A Day at the Drive", will launch Australia's summer of tennis and take place at the city's Memorial Drive Tennis Centre on Jan 29.

Barty, 24, has not played a competitive match since February, opting not to defend her French Open title and skipping the US Open in New York amid the Covid-19 pandemic.

"I am looking forward to playing my first match for the 2021 season in Adelaide," said the Queenslander, who won a WTA event in Adelaide last year.

"I have fond memories from the Adelaide International last year and it will be great to get back on court here for A Day at the Drive."

The Australian Open, the year's first Grand Slam, has been delayed until Feb 8 this year. The Melbourne Park venue will also host warm-up events from Jan 31.

Hundreds of other players and their entourages are undergoing mandatory 14-day quarantine in Melbourne.

Tennis Australia Chief Executive Craig Tiley said earlier in the week that the top players were sent to Adelaide to ensure organisers did not exceed the limit set by the authorities for people quarantining in Melbourne.

That decision prompted claims from some of those isolating in Melbourne that the big names were receiving better treatment.

Tiley did not disagree.

"... they're the top players in the world and my general rule is if you're at the top of the game, a Grand Slam champion, it's just the nature of the business," he said.

"You are going to get a better deal."