Top-10 seeds Jessica Pegula and Elena Rybakina swept into the fourth round, but Jasmine Paolini was not as lucky on Friday at the U.S. Open.

Ex-Wimbledon champ Marketa Vondrousova knocked off Italian seventh seed Paolini 7-6 (4), 6-1 in their third-round match.

The unseeded Czech hit six aces and remained unbroken throughout the clash. The pair were locked into a competitive back-and-forth in the key sixth game of the second set when Paolini sent a backhand stab sailing long to help Vondrousova convert her sixth break point.

"It was a very important game," Vondrousova said after the match. "Big difference between 4-2 and 5-1. It was a crazy game -- and the key to the match."

The 29-year-old Paolini had two straight-set wins leading into Friday's matchup, including breezing past teenage

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