Rafael Nadal powered past Chung Hyeon into the US Open fourth round, capitalising on the extra rest he enjoyed before facing the South Korean.
The Spanish second seed, who had a walkover in the previous round, had not played since Tuesday and it showed in a dominant 6-3 6-4 6-2 win.
By contrast, Chung had come through three rounds of qualifying and spent nine hours more on court.
Nadal faces 14th seed John Isner or 2014 champion Marin Cilic next.
More to follow.