Ukrainian fourth seed Elina Svitolina powered into the third round of the US Open with a 6-4 6-4 win against Russian Evgeniya Rodina on Thursday.
The 22-year-old, who had also reached the third round at Flushing Meadows in the previous two years, was barely troubled by her 89th-ranked opponent in a sun-kissed Arthur Ashe Stadium.
Svitolina lost focus in the second set at 5-2 when she allowed Rodina to pull a break back, but she held her following service game to wrap up the victory on the first match point with a backhand winner.
She next faces either American Shelby Rogers.
Japanese Naomi Osaka defeated Czech Republic's Denisa Allertova 6-3 4-6 7-5. 12th seed Jelena Ostapenko won 6-4 6-4 against Sorana Cirstea.
American Jennifer Brady cruised past Barbora Strycova from Czech Republic 6-1 6-1.
ROGERS-GAVRILOVA PLAY LONGEST MATCH
American Shelby Rogers and 25th-seeded Australian Daria Gavrilova set a record of 3hr 33min for the longest women's singles match played at the US Open.
Rogers won 7-6 (8/6), 4-6, 7-6 (7/5) on a fifth match point in a final set that lasted 90 minutes.
Their second-round tie on Court 10 went past the previous longest of the 3 hours and 23 minutes it took British qualifier Johanna Konta to defeat Spanish ninth seed Garbine Muguruza 7-6 (7/4), 6-7 (4/7), 6-2 in the second round of the 2015 US Open.
Rogers advanced to a third-round matchup Saturday against Ukraine's fourth-seeded Elina Svitolina for a spot in the last 16.