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World No 6 will instead face Mackenzie McDonald on Monday
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Four Australians in first-round action on day one at Melbourne Park
Alex de Minaur has received an early boost to his Australian Open chances after the withdrawal of his tough first-round opponent, former world No 6 Matteo Berrettini.
Berrettini announced he had suffered a recurrence of the abdomen problems which had plagued his 2025 season, forcing him to miss the French and US opens.