Lucy Li , 11 , becomes the youngest qualifier to win in U.S. Women 's Open history . Li makes an eight - over - par 78 , after two double - bogeys and a triple - bogey . American misses the halfway cut after carding another 78 on Sunday . `` She is so mature for her age , '' said 23-year-old Jessica Wallace , who played with Li and Catherine O'Donnell -- Former child prodigy Michelle Wie takes three - shot lead at halfway stage .
Lucy Li , 11 , becomes the youngest qualifier to win in U.S. Women 's Open history . Li makes an eight - over - par 78 , after two double - bogeys and a triple - bogey . American misses the halfway cut after carding another 78 on Sunday . Former child prodigy Michelle Wie takes three - shot lead at halfway stage .