Cruz Hewitt, the 15-year-old son of tennis great Lleyton Hewitt, is to make his Junior Davis Cup debut for Australia.
World No.4 and defending champion Elena Rybakina has withdrawn from the WTA Tour's Italian Open in Rome with illness.
Chris O'Connell had to retire and Alexei Popyrin, Rinky Hijikata and Daria Saville were all beaten at the Italian Open on a dismal day for Australia.