World No. 8 AlexdeMinaur will face the unseeded American ... as no Australian has reached the men's singles quarterfinals at the MelbournePark since Nick Kyrgios did it in 2015.
De Minaur is the top returner on the ATP tour, winning 32.8 per cent of games against serve over the past 12 months. Two years ago that would have been a major weapon against Sinner but less so now.
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