Blumenherst fights off early hole, advances in U.S. Amateur

In other matches, NCAA champion Azahara Munoz of Arizona State avoided an upset with a 2-and-1 win against Alison Lee, at 13 the youngest player in match play.

The eighth-seeded Munoz, from Spain, never trailed, though the match was still all-square through six holes. Munoz made a par 3 on the 187-yard seventh hole to take the lead for good and followed that with an eagle 3 on the par-5 eighth to go two up.

"I just found out that she was 13 this morning, and I was impressed," Munoz said. "She's going to be amazing. She hits 3 woods straighter than I hit my wedge. She's unbelievable."

Munoz was coming off Tuesday's low 18-hole round of 68 to finish 36 holes at 1-under 143. Lee, the 57th seed from Valencia, Calif., shot 151.

Fourth-seed Whitney Neuhauser of Barboursville, Va., was all-square with 61st seed Kristen Park, of Buena Park, Calif., through nine holes before going on to win 3 and 2.

Thirteen-year-old Pearl Jin of San Gabriel, Calif., carded five birdies in a six-hole span to pull away from 10th-seed Victoria Tanco of Argentina for a 6-and-4 victory.