Ian Poulter remains on course for a second WGC Match Play title in Arizona after reaching the quarter-finals with a win over South African Tim Clark.
The Englishman won 5&3 in the third round and will return to action later on Saturday against Steve Stricker in the last eight.
WGC Match Play winners
- 2012: Hunter Mahan
- 2011: Luke Donald
- 2010: Ian Poulter
- 2009: Geoff Ogilvy
- 2008: Tiger Woods
- 2007: Henrik Stenson
- 2006: Geoff Ogilvy
Organisers are looking to get back on schedule after
freak snowstorms delayed the start
of the competition.
Northern Ireland's Graeme McDowell beat Ireland's Shane Lowry 3&2.
McDowell will next face Australian Jason Day, who saw off Masters champion Bubba Watson 4&3.
Saturday's play was delayed by 45 minutes after freezing conditions in the early morning, but once the action began it was 35-year-old American Robert Garrigus who made the first move of the day.
He beat Fredrik Jacobson 3&1, holding off a comeback that saw the Swede make birdies at the 11th, 12th and 13th by responding with a birdie at the 14th and an eagle on the 15th.
Graeme McDowell (NI) bt Shane Lowry (Ire) 3&2
Jason Day (Aus) bt Bubba Watson 4&3
Robert Garrigus bt Fredrik Jacobson (Sweden) 3&1
Matt Kuchar bt Nicolas Colsaerts (Belgium) 4&3
Webb Simpson bt Gonzalo Fernandez-Castano 2 up
Hunter Mahan bt Martin Kaymer (Germany) 5&4
Steve Stricker bt Scott Piercy by 1 hole
Ian Poulter (Eng) bt Tim Clark (South Africa) 5&3