Defending champion Rory McIlroy won at the second extra hole in his winner-takes-all group match against Kevin Na to advance to the last 16 of the World Golf Championship-Dell Match Play in Texas.
The world number three, who has never successfully defended a tournament as a professional, will be up against Open champion Zach Johnson in the first knockout round later today at Austin Country Club.
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WGC-Dell round of 16
Jordan Spieth vs. Louis Oosthuizen
Patrick Reed vs. Dustin Johnson
Byeong-Hun An vs. Rafael Cabrera-Bello
Ryan Moore vs. Patton Kizzire
Rory McIlroy vs. Zach Johnson
Chris Kirk vs. Bill Haas
Matt Kuchar vs. Brooks Koepka
Brandt Snedeker vs. Jason Day