Carlos Alcaraz had far too much firepower for Matteo Arnaldi in their fourth-round US Open clash on Monday night.
After being bundled out of the US Open, Iga Swiatek has already come to terms with no longer being world number one when the tournament ends.
Novak Djokovic looked back to his best as he eased past Croatian qualifier Borna Gojo to reach the last eight at the US Open on Sunday.
Iga Swiatek's reign as world number one and US Open champion was brought to an end by a spirited Jelena Ostapenko at Flushing Meadows on Sunday.
Alexander Zverev needed nearly four hours to defeat Grigor Dimitrov 6-7(2) 7-6(8) 6-1 6-1 to reach the Round of 16 at the US Open for the fourth time.
Ninth seed Marketa Vondrousova needed just 57 minutes to dismiss Ekaterina Alexandrova and match her best US Open run by reaching the Round of 16.