Northern Ireland's Graeme McDowell has defeated the Republic's Shane Lowry 3&2 to reach the last eight at the WGC World Match Play in Arizona.

Lowry created a stir on Thursday as the 64th seed dispatched world number one Rory McIlroy in the first round and followed that up with a comprehensive 6&5 demolition of Carl Petterssen in round two. However, he had no answer as he came up against McDowell today, with G-Mac making four birdies to reach the turn four up.

McDowell made no further gains over the back nine, and saw Lowry close the gap by one when he bogeyed the 15th, but it was all over on the next as both men hit pars.

Next up for McDowell is Australia's Jason Day, who is through to the last eight for the second time in three attempts after a 4&3 win over Bubba Watson.

Day made six birdies and nine pars in 15 holes as he won seven holes to Watson's three before his American opponent offered his hand.

Graeme McDowell v Jason Day
Robert Garrigus v Matt Kuchar
Steve Stricker v Ian Poulter
Webb Simpson v Hunter Mahan