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Rafael Nadal, left, and Roger Federer will play an exhibition Sunday to raise funds for Australian flood relief victims. ((Karim Sahib/Getty Images))

Roger Federer and Rafael Nadal will play an exhibition match on Sunday ahead of the Australian Open to raise funds for the country's flood victims.

Federer, Nadal, Novak Djokovic and Kim Clijsters will join Lleyton Hewitt in a "Rally for Relief" match at Rod Laver Arena in Melbourne, Australia.

Also participating will be Sam Stosur and retired star Pat Rafter, who both come from the affected state of Queensland.

Stosur said the flooding, which has killed 25 people since November and trashed the city of Brisbane, is an "enormous disaster" and "lots of us just want to make some sort of contribution."

Federer, Nadal and Clijsters took part in a similar fundraising match last year — that time following the earthquake in Haiti.