McIlroy, Stenson ousted at WGC Match Play
Sergio Garcia of Spain hits a tee shot on the third hole during the second round of the World Golf Championships - Accenture Match Play Championship at The Golf Club at Dove Mountain on February 20, 2014 in Marana, Arizona - by Sam Greenwood
South African eighth seed Louis Oosthuizen, the 2010 British Open champion, defeated Sweden's Stenson 4 and 3 while US ninth seed Harris English dispatched McIlroy in 19 holes.
Stenson's defeat continues a trend in which the overall top seed at the $9 million event has not gone beyond the second round since 2008.
Day, a second seed from Australia, took four extra holes to eliminate US 10th seed Billy Horschel.
Spanish second seed Sergio Garcia and American Rickie Fowler advanced to a third-round meeting.
Garcia outlasted American Bill Haas 3 and 1 and Fowler edged US compatriot Jimmy Walker 1 up, beating the only winner of three US PGA Tour events this season.
Haas sank a six-foot eagle putt at the second hole to seize the lead and a par at the seventh put him 2-up, but Garcia eagled to win the eighth and squared the match with a par at 11, then birdied three of the next six holes to take the match.
"He played really well early on, then I was able to go on a very nice run from the eighth hole," said Garcia, adding that he was "very pleased," with the win.
Fowler and Walker each won three of the first six holes in a match that was never more than 1-up in either's favor. Both players missed birdie putts at the 18th but Walker could not make par from 14 feet while Fowler two-putted for par from 51 feet, sinking a six footer to win.
"Finally got the putter to roll a couple in," said Fowler.
Also through to the last 16 at the 64-player event is seventh-seeded Frenchman Victor Dubuisson, who dispatched Swedish 15th seed Peter Hanson 3 and 1.
Event debutant Dubuisson opened with three birdies but was squared after Hanson birdied three in a row starting at the fifth. A seven-foot birdie at the eighth again gave the Frenchman the lead and he kept it to the end, finishing the match with a 15-foot birdie at 17.
"I did play well," Dubuisson said. "I started the first few holes and I made some good birdies. Then he made three birdies and we were all square. Then I decided just don't watch him play, just play my stroke play and try to make some birdies."
Next up for Dubuisson is American Bubba Watson, last week's PGA winner at Riviera, who eliminated Swede Jonas Blixt 2 up.