Jon Rahm was the major casualty from the WGC Match Play on Friday as Scottie Scheffler, Rory McIlroy and Patrick Cantlay all advanced with perfect records.
The Spanish second seed was dumped out after losing 5 and 4 to 2021 WGC Match Play winner Billy Horschel in their final Group 2 match at the Austin Country Club in Texas.
Horschel went 1-up with a par on the second hole and never relinquished the lead, with Rahm failing to register a birdie throughout the day's play.
The 36-year-old American pulled away with birdies on the 10th and 11th holes followed by a 21-foot birdie putt on the 14th to clinch a spot in the round of 16 against Cameron Young.
Horschel progressed in a tight group with a 2-0-1 record ahead of Rickie Fowler (2-1-0), Rahm (1-2-0) and Keith Mitchell (0-2-1).
Upset Alert - @BillyHo_Golf takes down Jon Rahm en route to advancing to the Round of 16 @DellMatchPlay. pic.twitter.com/d6iodPgfvi— PGA TOUR (@PGATOUR) March 24, 2023
Top seed and reigning champion Scheffler advanced after beating Tom Kim 3 and 2 to round out a 3-0-0 group stage record.
Kim came out strong with birdies on the first two holes to go 2-up, but Scheffler rallied back immediately winning three of the next four holes.
Third seed McIlroy topped Group 3 unblemished after beating Keegan Bradley 3 and 2, while fourth seed Cantlay beat Brian Harman 2 and 1 to top Group 4 with a 3-0-0 record.
Kurt Kitayama won a three-way sudden death playoff over Tony Finau and Adrian Meronk to progress atop Group 10.
Canadian Mackenzie Hughes produced an upset to advance via Group 12 from Taylor Montgomery who he beat 6 and 4. Jordan Spieth, who beat Hughes on Thursday, missed out after losing to Shane Lowry 2 and 1.
J.J. Spaun also pulled off a surprise by topping Group 11 with a 3-0-0 record, downing Min Woo Lee 2 and 1 to seal his progress.
Max Homa, Xander Schauffele, Andrew Putnam, Matt Kuchar, Sam Burns, Lucas Herbert, J.T. Poston, Jason Day and Young also all progressed into Saturday's last 16 knockout stage.
Round of 16 for @DellMatchPlay pic.twitter.com/a30qkw9iIN— PGA TOUR (@PGATOUR) March 24, 2023