World number one Iga Swiatek got her US Open title defence off to a dominant start on Monday, flattening unseeded Swede Rebecca Peterson 6-0 6-1 to kick off the action in Arthur Ashe Stadium.
The four-time Grand Slam champion fired off 20 winners and four aces to set up a second-round meeting with Australian Daria Saville.
Swiatek said that her tank was "pretty empty" after losing in the Montreal and Cincinnati semi-finals earlier this month but showed no lack of vigor as she opened her U.S.
Open campaign with an ace and blazed through the first set. The Polish player showed only brief signs of vulnerability early in the second set, as she began to accrue more unforced errors and had to claw her way back from triple break point in the first game.