Roger Federer, Serena Williams and Rafael Nadal will take part in an exhibition match to raise money for a bushfire relief fund in Australia.
The match is scheduled for January 15, five days before the start of the Australian Open, and will take place at Melbourne's Rod Laver Arena.
Australian Nick Kyrgios will also be playing, along with Stefanos Tsitsipas, Naomi Osaka and Caroline Wozniacki.
All funds raised from the two-and-a-half-hour event, called AO Rally for Relief, will be donated to the relief cause with tickets priced at A$54 (AED 136).
Hundreds of fires have scorched more than 25 million acres of land, killing at least 25 people and an estimated 500 million animals in recent months.
Fourteen-time French Open champion Rafa Nadal said there was still a chance this year's tournament in Paris may not be his last in comments ahead of his tough opener against fourth seed Alexander Zverev.
Outgoing Barcelona manager Xavi Hernandez said he was proud of his achievements with the club and was looking forward to being a fan again as he prepares to coach his final game against Sevilla.
World number one Novak Djokovic does not consider himself a favourite ahead of his title defence at the French Open, which begins with a first-round match against local hope Pierre-Hugues Herbert on Sunday.
Real Madrid midfielder Aurelien Tchouameni will miss the Champions League final due to a foot injury and could be a doubt for the European Championship, Real manager Carlo Ancelotti said on Friday.