Cole Hammer (USGA photo)

The day began with a playoff to decide the final three spots on the match-play bracket. Geritz, of Towson, Md., was among those to get in, even if it was short-lived.

“I'm playing well, have a lot of confidence,” Chinn told the USGA. “I’m going to have to hit a lot better shots. I'm just going to sharpen my game and keep moving forward.”

There are three USGA champions in this field, and all three remain alive after the first round of match play. Their opponents made them work for it, however.

Shuai Ming (Ben) Wong, who combined with Frankie Capan to win the 2017 U.S. Amateur Four-Ball, was all square in his match against Jake Beber-Frankel on the 17th tee. He won the final two holes to advance.

Cole Hammer, who was part of the winning U.S. Amateur Four-Ball team in 2018, had a similar story. Hammer birdied the 18th to win his match against Jackson Suber.

Hammer’s Four-Ball partner, Garrett Barber, put together his 1-up victory much differently. Barber got to 2-up on Jack Rahon when he birdied Nos. 10 and 11. Rahon took one back with a birdie at No. 14, but otherwise the two matched pars until Rahon ran out of holes.

The day’s largest victories were authored by Akshay Bhatia, the Sage Valley Junior Invitational champion, and William Mouw, the 2017 Western Junior champion. Both players won their match on the 13th hole.

"This week is going to be a huge grind, especially on this tough of a golf course," Bhatia said. "Just kind of realizing that pars will really win a lot of holes. If you sneak a couple birdies in, that's also a bonus.”