Inbee Park, trying to add to an already historic season, was among those tied for third at 65.
Stanford birdied her final three holes late in the afternoon at the Grey Silo course to grab a share of the lead. Matthew had an early tee time and bounced back from a bogey she suffered on her second hole of the day. The 63 for Matthew was the lowest 18-hole score she has ever posted on the LPGA Tour.
Park has six victories this year that include all three major events played thus far. She also has captured each of her last three tournaments.