Nine of the top ten seeds from stroke play have been eliminated at the U.S. Amateur Championship at Hazeltine National Golf Club in Chaska, Minn.
Jackson Buchanan, a standout at Illinois this season who won the Duck Invitational and finished in solo second place at the Big Ten Championships, defeated Luke Clanton 1 up. Clanton led 1-up through 14 holes, but Buchanan won holes No. 15 and 16, and the pair halved the final two holes to give Buchanan the win. Clanton had a birdie attempt to win, but it just missed on the low side.
Clanton is currently ranked No. 1 in the Golfweek/AmateurGolf.com World Rankings.
With Clanton's loss, the marquee grouping of stroke play has been eliminated. Clanton, Gordon Sargent, and Jackson Koivun have all lost.
Another round-of-32 upset was West Virginia Amateur champion Christian Brand, who took down No. 2 seed Ethan Evans one-up and held off Evans on the final five holes.
Round of 32 results
No. 64 Ethan Fang def. No. 33 Zach Adams 2 and 1
No. 17 Bastian Amat def. No. 49 Hunter Logan 2 and 1
No. 25 Garrett Engle def. No. 57 Zach Pollo 2 and 1
No. 41 Noah Kent def. No. 9 Tom Fischer 2 and 1
No. 61 Omar Morales def. No. 36 Calum Scott 3 and 2
No. 20 Jacob Modleski def. No. 52 Tommy Morrison 3 and 2
No. 28 Tyler Mawhinney def. No. 5 Paul Chang 2 and 1
No. 53 Jackson Buchanan def. No. 21 Luke Clanton 1 up
No. 47 Jose Luis Ballester def. No. 15 Tiger Christensen 3 and 1
No. 34 Christian Brand def. No. 2 Ethan Evans 1-up
No. 46 Phichaksn Maichon def. No. 51 James Ashfield 4 and 2
No. 3 Luis Masaveu def. No. 30 Jackson Herrington 1-up
No. 27 Brendan Valdes def. No. 59 Caleb Shetler 2 and 1
No. 54 Peter Fountain def. No. 43 Patrick Sheehan 1-up
No. 23 Bobby Massa def. TK Chantananuwat 1-up
No. 58 Ashton McCulloch def. No. 39 Wheaton Ennis 1-up
Round of 16 matchups
No. 64 Ethan Fang vs. No. 17 Bastian Amat
No. 25 Garrett Engle vs. No. 41 Noah Kent
No. 61 Omar Morales vs. No. 20 Jacob Modleski
No. 28 Tyler Mawhinney vs. No. 53 Jackson Buchanan
No. 34 Christian Brand vs. No. 47 Jose Luis Ballester
No. 58 Ashton McCulloch vs. No. 23 Bobby Massa
No. 3 Luis Masaveu vs. No. 46 Phichaksn Maichon
No. 27 Brendan Valdes vs. No. 54 Peter Fountain