NEW YORK :Last year's runner-up Jessica Pegula sprinted through her U.S. Open fourth-round clash with American compatriot Ann Li to win 6-1 6-2 on Sunday, moving with ruthless efficiency to close it out in under an hour.

Pegula had a poor run-up to the tournament, exiting early from Washington, Montreal and Cincinnati, but has yet to drop a set in New York and put up a dozen winners on Arthur Ashe Stadium as she found her power from the baseline.

She next plays either Czech Barbora Krejcikova or American Taylor Townsend.

"I felt really comfortable moving today," said Pegula. "I felt like today I started off really well and I just wanted to keep executing that."

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