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Cirstea, 33, who last played in the quarterfinals of a Grand Slam at the French Open in 2009, prevailed 6-3, 6-3 to ease past her 15th-seeded opponent.
It is only the second time in 59 appearances in the main draw of a Slam event that 30th seed Cirstea has made it into the quarterfinals.
The Romanian, who upset fourth seed Elena Rybakina in the third round on Friday, will play Czech 10th seed Karolina Muchova in the quarterfinals tomorrow.
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