Czech Barbora Krejcikova is into her first Grand Slam semi-final after seeing off American teenager Coco Gauff in a nervy French Open encounter.
Gauff, 17, let five set points slip as Krejcikova took the opener on a tie-break before sealing a 7-6 (8-6) 6-3 victory on her sixth match point.
The 25-year-old eventually wrapped up an intriguing quarter-final battle in one hour and 50 minutes in Paris.
"I never imagined I would be standing here one day," she said.
"Already for me this is something I have never dreamed of. I was really playing a great match and Coco is incredible - she is 17, it's amazing.