Iga Swiatek and Daniil Medvedev, the last two former champions left in the U.S. Open singles draws after a series of upsets, swept into the quarterfinals at Flushing Meadows with a minimum of fuss on Monday.

Top seed Swiatek, who won the title two years ago, showcased her all-court game in a straightforward 6-4 6-1 win over Russian Liudmila Samsonova to open the evening session at Arthur Ashe Stadium and warned she was only going to improve.

¡°At the beginning, it wasn¡¯t easy to get the rhythm, especially because we kind of put our focus more on recovery than actually practicing before the slam,¡± Swiatek said of her week in New York.