Giant-killing Alex Michelsen can scarcely believe he's reached the Australian Open fourth round after pulling off a Sampras, Agassi-like feat to power into the second week of a grand slam for the first time.
The 20-year-old Michelsen followed up his shock first-round removal of world No.11 and 2023 Open runner-up Stefanos Tsistipas with a stunning straight-sets defeat of 19th seed Karen Khachanov on Saturday.
