In June in the Public Links, Diaz-Yi, from Thousand Oaks, Calif., routed Chen 10 and 9.
The 20-year-old Chen, a member of Southern California’s NCAA championship team, will face 17-year-old Yueer Cindy Feng, of Orlando, Fla., today at the Country Club of Charleston.
Feng, born in China, beat Annie Park, of Levittown, N.Y., 6 and 4. Park won the NCAA individual title this year as a freshman at Southern California.
In the other quarterfinals, 18-year-old Alison Lee, of Valencia, Calif., beat Katelyn Sepmoree, of Tyler, Texas, 4 and 3; and 19-year-old Emma Talley, of Princeton, Ky., edged Su-Hyun Oh, of Australia, with a par on the 19th hole.
WEB.COM TOUR: In Springfield, Mo., Alex Prugh, Hunter Haas and Miguel Carballo shared the clubhouse lead when second-round play in the Price Cutter Charity Championship was suspended because of darkness.
The rain in southwest Missouri stopped long enough to get in a full day of golf, but the tournament is still trying to catch up from a lengthy rain delay on Thursday morning. Half of the field had yet to complete the second round when play was suspended.
Prugh (63 on Friday), Haas (65) and Carballo (65) are tied at 12-under 132.
Andrew Loupe (68) is two shots back.
Of those still on the course Daniel Chopra is 10-under par through 13 holes.
Aiken native Matt Hendrix is 4-under through seven holes and Augusta’s Scott Parel is 1-under through 10.