Gauff, 18 years old and ranked 23 in the world, triumphed 7-5, 6-2.
She will face Italy's 59th-ranked Martina Trevisan for a place in Saturday's championship match.
Gauff reaches first Grand Slam semi-final at French Open
Gauff, 18 years old and ranked 23 in the world, triumphed 7-5, 6-2.
She will face Italy's 59th-ranked Martina Trevisan for a place in Saturday's championship match.
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