Quiros not only matched the course record at Jumeirah Golf Estates, but he also set a new 36-hole scoring record. He finished two rounds at 12-under-par 132, which bettered the old 36-record by three strokes.
First-round leader Peter Hanson birdied the 18th for an even-par 72. He is alone in second place at minus-eight.
Robert Rock shot three-under 69 to join Rory McIlroy in a share of third place at seven-under-par 137. McIlroy bogeyed the last two holes for a one-under 71.
Paul Casey (66) and Paul Lawrie (73) are tied for fifth at minus-six.
World No. 1 Luke Donald posted a four-under 68 to move into a share of 12th at four-under-par 140.
Donald has a big lead over McIlroy in the Order of Merit. However, if McIlroy wins this event and Donald finishes ninth or worse, McIlory would win the Order of Merit. If Donald wins the money title, he would be the first player to top both the PGA Tour and European Tour money lists in the same season.
MORE TO FOLLOW.