Cape Town - South Africa's Louis Oosthuizen has knocked world No 1 Jordan Spieth out of the WGC-Dell Match Play in the Round of 16.
Oosthuizen won 4/2 and will face American Dustin Johnson in the quarter-finals later on Saturday.
Johnson was a 3/2 winner over compatriot Patrick Reed.
World Golf Championships Match Play knock-out round scores on Saturday at Austin, Texas (x-denotes seeding):
Round of 16
Rafa Cabrera Bello (ESP) bt An Byeong-Hun (KOR) WD
Chris Kirk (USA) bt Bill Haas (USA) 2 and 1
Rory McIlroy (NIR x3) bt Zach Johnson (USA x14) 1 up
Jason Day (AUS x2) bt Brandt Snedeker (USA x15) 3 and 2
Brooks Koepka (USA) bt Matt Kuchar (USA) 1 up
Ryan Moore (USA) bt Patton Kizzire (USA) 4 and 3
Louis Oosthuizen (RSA x16) bt Jordan Spieth (USA x1) 4 and 2
Dustin Johnson (USA x8) bt Patrick Reed (USA x9) 3 and 2
Rory McIlroy (NIR x3) v Chris Kirk (USA)
Jason Day (AUS x2) v Brooks Koepka (USA)
Ryan Moore (USA) v Rafa Cabrera Bello (ESP)
Louis Oosthuizen (RSA x16) v Dustin Johnson (USA x8)