Defending champion Peter Uihlein advanced to the second round of the rain-delayed U.S. Amateur, beating Canada's Eugene Wong 3 and 1 on Wednesday at Erin Hills.
The Oklahoma State player will face South Africa's Dylan Frittelli, a 5-and-4 winner over Jim Markovitz.
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UCLA star Patrick Cantlay led Max Scodro 4-up after 11 holes when play was suspended because of darkness.
Harris English, the Georgia player who won a Nationwide Tour event last month in Columbus, Ohio, beat Andrew Yun 3 and 1. Buldogs teammate Russell Henley, also a winner this year on the Nationwide Tour, had a 1-up lead over Kevin Dougherty after 12 holes.