He brushed aside Italy's Luciano Darderi in straight sets.
Top seed Alexander Zverev is into the quarter-finals at the US Open tennis, brushing aside Italy's Luciano Darderi in straight sets.
The German meets Dutchman Botic van de Zandschulp in the last eight in New York.
The first men's quarter final this evening sees an all-American clash as Frances Tiafoe takes on Alex Michelsen.
Elsewhere, last night Coco Gauff eased past Iva Jovic.
While Australian Open champion Elena Rybakina saw off the challenge of Naomi Osaka without dropping a set.
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