Andy Murray will face a tough start to his Australian Open campaign against Matteo Berrettini as Novak Djokovic makes his return on Tuesday.
Murray, a five-time finalist at Melbourne Park, will take on Italian 13th seed and last year's semi-finalist Berrettini on Rod Laver Arena.
Serbia's nine-time champion Djokovic returns a year after his controversial deportation saw him miss the Slam.
Women's second seed Ons Jabeur also features in the night session.
Elsewhere, Britain's Dan Evans faces Argentine Facundo Bagnis as he bids to join compatriots Cameron Norrie and Emma Raducanu in the second round.