Top seed Karolina Pliskova started her bid for a first Grand Slam title with a comfortable win against Poland's Magda Linette in the US Open first round.
The Czech world number one, 25, was not at her fluent best, making 19 unforced errors in a 6-2 6-1 victory.
But ultimately Pliskova - last year's beaten finalist - had too much power for her 72nd-ranked opponent.
She hit eight aces and 29 winners to beat Linette, who has only one US Open win, in one hour and 18 minutes.
"I felt a little bit nervous coming out here, especially after last year.