Madison Keys upset third seed Jessica Pegula to win their all-American US Open clash and advance to the quarter-finals on Monday.
Keys, a finalist at the US Open in 2017, dominated an out-of-sorts Pegula from the outset to win 6-1, 6-3. The 17th seed will face either American Peyton Stearns or Marketa Vondrousova in the quarter-finals on Wednesday.
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